aggressive (adj.)

• abrupt
• active
• acute
• adventuresome
• adventurous
• ambitious
• animated
• antagonistic
• assertive
• bearish
• beastly
• bellicose
• belligerent
• bloodthirsty
• bloody
• bloody-minded
• bluff
• blunt
• bold
• brash
• brisk
• brusque
• cavalier
• chauvinistic
• churlish
• combative
• contentious
• crusty
• curt
• disputatious
• divisive
• domineering
• driving
• dynamic
• energetic
• enterprising
• enthusiastic
• eristic
• factious
• ferocious
• fierce
• fighting
• forceful
• forcible
• forward
• gruff
• hard-hitting
• harsh
• hawkish
• hearty
• hostile
• imperious
• impetuous
• incisive
• inimical
• intense
• irascible
• irritable
• jingoistic
• keen
• kinetic
• litigious
• lively
• living
• lusty
• martial
• masterful
• mettlesome
• militant
• militaristic
• military
• offensive
• partisan
• peppy
• polemic
• pugnacious
• pushful
• pushy
• quarrelsome
• robust
• rough
• sanguinary
• sanguineous
• savage
• scrappy
• self-assertive
• severe
• sharp
• short
• shrewish
• snappy
• soldierlike
• soldierly
• spanking
• spirited
• strenuous
• strong
• surly
• tough
• trenchant
• trigger-happy
• truculent
• unfriendly
• unpeaceable
• unpeaceful
• up-and-coming
• venturesome
• venturous
• vibrant
• vigorous
• vivacious
• vivid
• warlike
• warring
• zestful
• zesty
• zippy