aggressive adj
1. having or showing determination and energetic pursuit of your ends; "an aggressive businessman"; "an aggressive basketball player"; "he was aggressive and imperious; positive in his convictions"; "aggressive drivers" [ant: unaggressive]
2. marked by aggressive ambition and energy and initiative; "an aggressive young exective"; "a pushful insurance agent"; "a pushing youth intent on getting on in the world" [syn: enterprising, pushful, pushing, pushy]
3. tending to spread quickly; "an aggressive tumor" [syn: fast-growing(a)]
4. characteristic of an enemy or one eager to fight; "aggressive acts against another country"; "a belligerent tone" [syn: belligerent]

Aggressive \Ag*gres"sive\, a. [Cf. F. agressif.] Tending or disposed to aggress; characterized by aggression; making assaults; unjustly attacking; as, an aggressive policy, war, person, nation. -- Ag*gres"sive*ly, adv. -- Ag*gres"sive*ness, n. No aggressive movement was made. --Macaulay.

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In psychology, as well as other social and behavioral sciences, aggression (also called combativeness) refers to behavior between members of the same species that is intended to cause pain or harm. Predatory behavior between members of one species towards another species is also described as "aggression." To exhibit aggression towards members of another species is common, such as in these examples: "Lions are aggressive hunters of antelopes," and "Eagles are aggressive hunters of small mammals."

Aggression takes a variety of forms among human beings, and it can be physical, mental, or verbal. Aggression should not be confused with assertiveness.

There are two broad categories of aggression. These include hostile, affective, or retaliatory aggression and instrumental, predatory, or goal-oriented aggression.

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