Aggressive

a.	1.	Tending or disposed to aggress; having or showing determination and energetic pursuit of one's own ends at the expense of others or mindless of others' needs or desires; characterized by aggression; making assaults; unjustly attacking; as, an aggressive policy, war, person, nation; an aggressive businessman; an aggressive basketball player; he was aggressive and imperious in his convictions; aggressive drivers. Opposite of unaggressive. No aggressive movement was made. - Macaulay.
	2.	marked by self-confident ambition, competitiveness, energy and initiative; as, an aggressive young executive.
	3.	(Med., Biol.) tending to spread quickly
	4.	characteristic of an enemy or one eager to fight

Adj.	1.	aggressive - 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" Antonyms: nonaggressive, unaggressive - not aggressive; not given to fighting or assertiveness
	2.	aggressive - marked by aggressive ambition and energy and initiative; "an aggressive young exective"; "a pushful insurance agent"; "a pushing youth intent on getting on in the world" Synonyms: pushful, pushing, pushy, enterprising
	3.	aggressive - tending to spread quickly; "an aggressive tumor" Synonyms: fast-growing
	4.	aggressive - characteristic of an enemy or one eager to fight; "aggressive acts against another country"; "a belligerent tone" Synonyms: belligerent

abrupt, active, acute, adventuresome, adventurous, ambitious, animated, antagonistic, assertive, battling, bearish, beastly, bellicose, bickering, bloodthirsty, bloody, bloody-minded, bluff, blunt, bold, brash, brisk, brusque, cavalier, chauvinist, chauvinistic, churlish, combative, contentious, crusty, curt, disputatious, divisive, domineering, driving, dynamic, enemy, energetic, enterprising, enthusiastic, eristic, factional, factious, ferocious, fierce, fighting, forceful, forcible, forward, full of fight, full of pep, go-ahead, go-go, gruff, hard-hitting, harsh, hawkish, hearty, hustling, imperious, impetuous, incisive, inimical, intense, irascible, irritable, jingo, jingoish, jingoist, jingoistic, keen, kinetic, litigious, lively, living, lusty, martial, masterful, mettlesome, militaristic, military, on the offensive, partisan, peppy, polarizing, polemic, pugnacious, pushful, pushing, pushy, quarrelsome, robust, rough, saber-rattling, sanguinary, sanguineous, savage, scrappy, self-assertive, severe, sharp, short, shrewish, smacking, snappy, snippy, soldierlike, soldierly, spanking, spirited, strenuous, strong, surly, take-charge, take-over, tough, trenchant, trigger-happy, truculent, unfriendly, unpacific, unpeaceable, unpeaceful, up-and-coming, venturesome, venturous, vibrant, vigorous, vivacious, vivid, warlike, warmongering, warring, wrangling, zestful, zesty, zippy