"aggressive" in the adjective sense
1. aggressive
having or showing determination and energetic pursuit of your ends positive in his convictions"
"an aggressive businessman"
"an aggressive basketball player"
"he was aggressive and imperious
"aggressive drivers"
2. aggressive, fast-growing, strong-growing
tending to spread quickly
"an aggressive tumor"
3. aggressive, belligerent
characteristic of an enemy or one eager to fight
"aggressive acts against another country"
"a belligerent tone"
Source: WordNet® (An amazing lexical database of English)
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