Aggressive definition

(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"

(2) Characteristic of an enemy or one eager to fight

"Aggressive acts against another country"

"A belligerent tone"

(3) Tending to spread quickly

"An aggressive tumor"