Imperil Im·per"il transitive verb [ imperfect & past participle Imperiled or Imperilled ; present participle & verbal noun Imperiling or Imperilling .] To bring into peril; to endanger.

Imperilment Im·per"il·ment noun The act of imperiling, or the state of being imperiled.

Imperious Im·pe"ri·ous adjective [ Latin imperiosus : confer French impérieux . See Imperial .] 1. Commanding; ascendant; imperial; lordly; majestic. [ Obsolete] "A vast and imperious mind." Tilloison.

Therefore, great lords, be, as your titles witness,
Imperious .

Shak. 2. Haughly; arrogant; overbearing; as, an imperious tyrant; an imperious manner.

This imperious man will work us all
From princes into pages.

Shak.

His bold, contemptuous, and imperious spirit soon made him conspicuous.

Macaulay. 3. Imperative; urgent; compelling.

Imperious need, which can not be withstood.

Dryden. Syn. -- Dictatorial; haughty; domineering; overbearing; lordly; tyrannical; despotic; arrogant; imperative; authoritative; commanding; pressing. -- Imperious , Lordly , Domineering . One who is imperious exercises his authority in a manner highly offensive for its spirit and tone; one who is lordly assumes a lofty air in order to display his importance; one who is domineering gives orders in a way to make others feel their inferiority.

Imperiously Im·pe"ri·ous·ly adverb In an imperious manner.

Imperiousness Im·pe"ri·ous·ness noun The quality or state of being imperious; arrogance; haughtiness.

Imperiousness and severity is but an ill way of treating men who have reason of their own to guide them.

Locke.

Imperishability Im·per`ish·a·bil"i·ty noun The quality of being imperishable: indstructibility. "The imperishability of the universe." Milman.

Imperishable Im·per"ish·a·ble adjective [ Prefix im- not + perishable : confer French impérissable .] Not perishable; not subject to decay; indestructible; enduring permanently; as, an imperishable monument; imperishable renown. -- Im*per"ish*a*ble*ness , noun -- Im*per"ish*a*bly , adverb

Imperium Im·pe"ri·um noun ; plural Imperia . [ Latin See Empire .] 1. Supreme power; absolute dominion; empire. 2. (Law) The right to command, which includes the right to employ the force of the state to enforce the laws. It is one of the principal attributes of the executive power.

Imperiwigged Im·per"i"wigged adjective Wearing a periwig.

Impermanence, Impermanency Im·per"ma·nence, Im·per"ma·nen·cy noun lack of permanence.

Impermanent Im·per"ma·nent adjective Not permanent.

Impermeability Im·per`me·a·bil"i·ty noun [ Prefix im- not + permeability : confer French imperméabilité .] The quality of being impermeable.

Impermeable Im·per"me·a·ble adjective [ Prefix im- not + permeable : confer French imperméable , Latin impermeabilis .] Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air. -- Im*per"me*a*ble*ness , noun -- Im*per"me*a*bly , adverb

Impermissible Im`per·mis"si·ble adjective Not permissible.

Imperscrutable Im`per·scru"ta·ble adjective [ Latin imperscrutabilis .] Not capable of being searched out; inscrutable. [ Obsolete] -- Im`per*scru"ta*ble*ness , noun [ Obsolete]

Imperseverant Im`per·sev"er·ant adjective Not persevering; fickle; thoughtless. [ Obsolete]

Impersonal Im·per"son·al adjective [ Latin impersonalis ; prefix im- not + personalis personal: confer French impersonnel . See Personal .] Not personal; not representing a person; not having personality.

An almighty but impersonal power, called Fate.

Sir J. Stephen. Impersonal verb (Gram.) , a verb used with an indeterminate subject, commonly, in English, with the impersonal pronoun it ; as, it rains ; it snows ; methinks (it seems to me). Many verbs which are not strictly impersonal are often used impersonally; as, it goes well with him.

Impersonal Im·per"son·al noun That which wants personality; specifically (Gram.) , an impersonal verb.

Impersonality Im·per`son·al"i·ty noun The quality of being impersonal; want or absence of personality.

Impersonally Im·per"son·al·ly adverb In an impersonal manner.

Impersonate Im·per"son·ate transitive verb [ imperfect & past participle Impersonated ; present participle & verbal noun Impersonating .] 1. To invest with personality; to endow with the form of a living being. 2. To ascribe the qualities of a person to; to personify. 3. To assume, or to represent, the person or character of; to personate; as, he impersonated Macbeth.

Benedict impersonated his age.

Milman.

Impersonation, Impersonification Im·per`son·a"tion, Im`per·son`i·fi·ca"tion noun The act of impersonating; personification; investment with personality; representation in a personal form.

Impersonator Im·per"son·a`tor noun One who impersonates; an actor; a mimic.

Imperspicuity Im·per`spi·cu"i·ty noun Want of perspicuity or clearness; vagueness; ambiguity.

Imperspicuous Im`per·spic"u·ous adjective Not perspicuous; not clear; obscure; vague; ambiguous.

Impersuadable Im`per·suad"a·ble adjective [ Confer Impersuasible .] Not to be persuaded; obstinate; unyielding; impersuasible. -- Im`per*suad"a*ble*ness , noun

Impersuasible Im`per·sua"si·ble adjective [ Prefix im- not + persuasible : confer Old French impersuasible .] Not persuasible; not to be moved by persuasion; inflexible; impersuadable. Dr. H. More. -- Im`per*sua`si*bil"i*ty noun

Impertinence Im·per"ti·nence noun [ Confer French impertinence . See Impertinent .] 1. The condition or quality of being impertinent; absence of pertinence, or of adaptedness; irrelevance; unfitness. 2. Conduct or language unbecoming the person, the society, or the circumstances; rudeness; incivility.

We should avoid the vexation and impertinence of pedants who affect to talk in a language not to be understood.

Swift. 3. That which is impertinent; a thing out of place, or of no value.

There are many subtile impertinences learned in schools.

Watts.

Impertinency Im·per"ti·nen·cy noun Impertinence. [ R.]

O, matter and impertinency mixed!
Reason in madness!

Shak.

Impertinent Im·per"ti·nent adjective [ French, from Latin impertinens , -entis ; prefix im- not + pertinens . See Pertinent .] 1. Not pertinent; not pertaining to the matter in hand; having no bearing on the subject; not to the point; irrelevant; inapplicable.

Things that are impertinent to us.

Tillotson.

How impertinent that grief was which served no end!

Jer. Taylor. 2. Contrary to, or offending against, the rules of propriety or good breeding; guilty of, or prone to, rude, unbecoming, or uncivil words or actions; as, an impertient coxcomb; an impertient remark. 3. Trifing; inattentive; frivolous. Syn. -- Rude; officious; intrusive; saucy; unmannerly; meddlesome; disrespectful; impudent; insolent. -- Impertinent , Officious , Rude . A person is officious who obtrudes his offices or assistance where they are not needed; he is impertinent when he intermeddles in things with which he has no concern. The former shows a want of tact, the latter a want of breeding, or, more commonly, a spirit of sheer impudence. A person is rude when he violates the proprieties of social life either from ignorance or wantonness. "An impertinent man will ask questions for the mere gratification of curiosity; a rude man will burst into the room of another, or push against his person, inviolant of all decorum; one who is officious is quite as unfortunate as he is troublesome; when he strives to serve, he has the misfortune to annoy." Crabb. See Impudence , and Insolent .

Impertinent Im·per"ti·nent noun An impertinent person. [ R.]

Impertinently Im·per"ti·nent·ly adverb In an impertinent manner. "Not to betray myself impertinently ." B. Jonson.

Impertransibility Im`per·tran`si·bil"i·ty noun The quality or state of being impertransible. [ R.]

Impertransible Im`per·tran"si·ble adjective [ Latin prefix im- not + pertransire to go through. See Per- and Transient .] Incapable of being passed through. [ R.]

Imperturbability Im`per·turb`a·bil"i·ty noun The state or quality of being imperturbable.
[ 1913 Webster]

Imperturbable Im`per·turb"a·ble adjective [ Latin imperturbabilis ; prefix im- not + perturbare to disturb: confer French imperturbable . See Perture .] Incapable of being disturbed or disconcerted; as, imperturbable gravity.

Imperturbably Im`per·turb"a·bly adverb In an imperturbable manner; calmly. C. Bronté.

Imperturbation Im·per`tur·ba"tion noun [ Latin imperturbatio .] Freedom from agitation of mind; calmness; quietude. W. Montagu.

Imperturbed Im`per·turbed" adjective Not perturbed.

Imperviability Im·per`vi·a·bil"i·ty noun The quality of being imperviable.

Imperviable Im·per"vi·a·ble adjective Not pervious; impervious. [ R.] -- Im*per"vi*a*ble*ness , noun [ R.]

Impervious Im·per"vi·ous adjective [ Latin impervius ; prefix im- not + per through + via way. See Voyage .] Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.

This gulf impassable, impervious .

Milton.

The minds of these zealots were absolutely impervious .

Macaulay. Syn. -- Impassable; pathless; impenetrable; imperviable; impermeable. -- Im*per"vi*ous*ly , adverb -- Im*per"vi*ous*ness , noun

Impery Im"per·y noun Empery. [ Archaic] Joye.

Impest Im·pest" transitive verb To affict with pestilence; to infect, as with plague. [ Obsolete]

Impester Im·pes"ter transitive verb See Pester . [ Obsolete]

Impetiginous Im`pe·tig"i·nous adjective [ Latin impetiginous : confer French impétigineux .] Of the nature of, or pertaining to, impetigo.

Impetigo Im`pe·ti"go noun [ Latin , from impetere to attack.] (Medicine) A cutaneous, pustular eruption, not attended with fever; usually, a kind of eczema with pustulation.

Impetrable Im"pe·tra·ble adjective [ Latin impetrabilis : confer French impétrable . See Impetrate .] Capable of being obtained or moved by petition. [ Obsolete] Bailey.

Impetrate Im"pe·trate adjective [ Latin impetratus , past participle of impetrare to obtain; prefix im- in + patrare to bring to pass.] Obtained by entreaty. [ Obsolete] Ld. Herbert.

Impetrate Im"pe·trate transitive verb [ imperfect & past participle Impetrated ; present participle & verbal noun Impetrating .] To obtain by request or entreaty. Usher.