1) Acting in opposition 2) Counter 3) Hostile 4) Little colonizer in torment 5) Negative 6) Unfriendly 1) Adverse 2) Against 3) Alienating 4) Antacid 5) Antidotal 6) Antiphlogistic 7) Argumentative 8) Compensative 9) Compensatory 10) Counter 11) Counteractive 12) Countervailing 13) Hostel 14) Hostile 15) Incompatible 16) Negative 17) Offsetting 18) Oppugnant 19) Violent 
• (a.) Alt. of Antagonistical
[adj] - indicating opposition or resistance 2. [adj] - characterized by antagonism or antipathy 3. [adj] - used especially of drugs or muscles that counteract or neutralize each other`s effect 4. [adj] - incapable of harmonious association
antagonistic 1. Of the nature of an antagonist; mutually opposed; actively opposed. 2. In physiology, said of the muscles which counteract each other's action.
Used to describe behaviors which are in opposition or conflict, especially between individuals.
adjective used especially of drugs or muscles that counteract or neutralize each other`s effectantipathetic adjective characterized by antagonism or antipathy; `slaves antagonistic to their masters`; `antipathetic factions within the party`
acting in opposition; opposing, esp. mutually. · hostile; unfriendly.