Aggressive–Thesarus

Adj. 1. aggressive – 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”
assertive, self-asserting, self-assertive – aggressively self-assured; “an energetic assertive boy who was always ready to argue”; “pointing directly at a listener is an assertive act”
hostile – characterized by enmity or ill will; “a hostile nation”; “a hostile remark”; “hostile actions”
offensive – for the purpose of attack rather than defense; “offensive weapons”
nonaggressive, unaggressive – not aggressive; not given to fighting or assertiveness
2. aggressive – tending to spread quickly; “an aggressive tumor”
fast-growing, strong-growing
invasive – marked by a tendency to spread especially into healthy tissue; “invasive cancer cells”
3. aggressive – characteristic of an enemy or one eager to fight; “aggressive acts against another country”; “a belligerent tone”
belligerent
hostile – characterized by enmity or ill will; “a hostile nation”; “a hostile remark”; “hostile actions”