polemical (adj.)

• aggressive
• argumentative
• bellicose
• belligerent
• combative
• contentious
• controversial
• dialectic
• disputatious
• divisive
• eristic
• factious
• ill-humored
• irascible
• irritable
• litigious
• partisan
• polemic
• pugnacious
• quarrelsome
• scrappy
• shrewish