Definition of aggressive
1a
: tending toward or exhibiting aggression
aggressive behavior
b
: marked by combative readiness
an aggressive fighter
2a
: marked by obtrusive energy and self-assertiveness
a rude, aggressive personality
b
: marked by driving forceful energy or initiative : enterprising
an aggressive salesman
3
: strong or emphatic in effect or intent
aggressive colors aggressive flavors
4
: growing, developing, or spreading rapidly
aggressive bone tumors
5
: more severe, intensive, or comprehensive than usual especially in dosage or extent
aggressive chemotherapy
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Merriam-Webster unabridged
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Time Traveler for aggressive
The first known use of aggressive was in 1716
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