Aggressive adj. 1.Tending or disposed to aggress; having or showing determination and energetic pursuit of one's own ends at the expense of others or mindless of others' needs or desires; characterized by aggression; making assaults; unjustly attacking; as, an aggressive policy, war, person, nation; an aggressive businessman; an aggressive basketball player; he was aggressive and imperious in his convictions; aggressive drivers. Opposite of unaggressive. "No aggressive movement was made."
2.Marked by self-confident ambition, vigorous competitiveness, energy and initiative; as, an aggressive young executive.
Synonyms: enterprising, pushful, pushing, pushy
3.(Med., Biol.) Tending to grow or spread quickly; as, an aggressive tumor. (Narrower terms: invasive (vs. noninvasive))
Synonyms: fast-growing(prenominal)
4.Tending to initiate unprovoked attacks; initiating unprovoked military action; eager to fight; as, aggressive acts against another country.
Synonyms: belligerent. Note: Narrower related terms: bellicose, combative, pugnacious, scrappy, truculent; hard-hitting, high-pressure; hostile (used of attempts to buy or take control of a business: "hostile takeover"; "hostile tender offer"); predatory, rapacious, raptorial, ravening, vulturine, vulturous. See also: assertive, hostile, offensive.