| aggressive(nasty, determined, hostile, spirited, argumentative) |
| antagonistic(nasty, determined, hostile, spirited, aggressive) |
| ardent(nasty, determined, hostile, spirited, aggressive) |
| at cross-purposes |
| at loggerheads(expression, nasty, determined, hostile, spirited) |
| at odds |
| at variance |
| battling(nasty, determined, hostile, spirited, aggressive) |
| bellicose(nasty, determined, hostile, spirited, aggressive) |
| belligerent(adjective, nasty, determined, spirited, aggressive) |
| cantankerous(nasty, determined, hostile, spirited, aggressive) |
| combative(nasty, determined, hostile, spirited, aggressive) |
| contentious(nasty, determined, hostile, spirited, aggressive) |
| fierce(nasty, determined, hostile, spirited, aggressive) |
| fighting(nasty, determined, hostile, spirited, aggressive) |
| flip(nasty, determined, hostile, spirited, aggressive) |
| have a bone to pick(expression, idiom, nasty, determined, hostile) |
| have chip on shoulder(expression, idiom, nasty, determined, hostile) |
| have it in for(expression, idiom, nasty, determined, hostile) |
| hostile(nasty, determined, spirited, aggressive, argumentative) |