1) Ill-suited 2) Immaterial 3) Impolite 4) Improper 5) Inapt 6) Incongruous 7) Inept 8) Inopportune 9) Irrelevant 10) Jarring 11) Malapropos 12) Rude 13) Unapt 14) Unbefitting 15) Undue 16) Unfitting 17) Unseemly 18) Unsuitable 19) Untoward 20) Unwise 21) Upsetting 22) Wrong 1) Improper 2) Indecorous 3) Malapropos 4) Not appropriate 5) Not fitting 6) Rude 7) Tasteless 8) Unbecoming 9) Unbefitting 10) Uncouth 11) Unsuitable 12) Wrong 
• (a.) Not instrument (to); not appropriate; unbecoming; unsuitable; not specially fitted; -- followed by to or for.
[Adjective] Not suitable for the situation.
In`ap·pro'pri·ate adjective Not instrument ( to ); not appropriate; unbecoming; unsuitable; not specially fitted; -- followed by to or for . -- 
[adj] - not conforming with accepted standards of propriety or taste 2. [adj] - not in keeping with what is correct or proper 3. [adj] - not suitable for a particular occasion etc
incompatible adjective not in keeping with what is correct or proper; `completely inappropriate behavior`
not appropriate; not proper or suitable: an inappropriate dress for the occasion.
not suitable for a particular occasion or use