Webster's English Dictionary

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aggressive

ag.gres.sive \*-'gres-iv\ aj 1a: tending toward or practicing aggression  
   1b: marked by combative readiness : MILITANT  2a: marked by driving 
   forceful energy or initiative : ENTERPRISING  2b: marked by obtrusive 
   energy : SELF-ASSERTIVE : AGGRESSIVE implies a disposition to dominate 
   often in disregard of others' rights or in determined and energetic pursuit 
   of one's ends; MILITANT also implies a fighting disposition but suggests 
   not self-seeking but devotion to a cause, movement, or principle; ASSERTIVE 
   suggests bold self-confidence in expression of opinion; SELF-ASSERTIVE 
   connotes unpleasant forwardness or brash self-confidence; PUSHING may apply 
   to ambition or enterprise or to snobbish and crude intrusiveness or 
   officiousness - ag.gres.sive.ly av SYN syn MILITANT, ASSERTIVE, 
   SELF-ASSERTIVE, PUSHING