n. someone who attacks

adj. characteristic of an enemy or one eager to fight; "aggressive acts against another country"; "a belligerent tone"

n. any hostile group of people; "he viewed lawyers as the real enemy"

n. a drug that neutralizes or counteracts the effects of another drug

n. a personal enemy; "they had been political foes for years"

n. the contestant you hope to defeat; "he had respect for his rivals"; "he wanted to know what the competition was doing"

adj. 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"

adj. defiantly aggressive; "a truculent speech against the new government"

adj. given to quarreling; "arguing children"; "quarrelsome when drinking"

adj. not disposed to friendship or friendliness; "an unfriendly coldness of manner"; "an unfriendly action to take"

adj. of or relating to litigation

adj. having a difficult and contrary disposition; "a cantankerous and venomous-tongued old lady"- Dorothy Sayers

adj. characterized by active hostility; "opponent (or opposing) armies"

adj. indicating hostility or enmity; "you certainly did me an ill turn"; "ill feelings"; "ill will"