1 adj An aggressive person or animal has a quality of anger and determination that makes them ready to attack other people.
(=belligerent)
Some children are much more aggressive than others..., Aggressive behaviour is a sign of emotional distress.
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aggressively adv
They'll react aggressively.
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aggressiveness n-uncount
(=aggression)
Her aggressiveness made it difficult for him to explain his own feelings.