| destructive(adjective, violent, cruel, vicious, hostile) |
| diligent(adjective, keen, intense, energetic, lively) |
| disruptive(adjective, hostile, belligerent) |
| dog-eat-dog(adjective, spirited, ambitious, competitive, bloodthirsty) |
| eager(adjective, clear, tough, severe, keen) |
| fighting(nasty, determined, hostile, spirited, radical) |
| flip(adjective, nasty, informal, determined, hostile) |
| go-getter(adjective, energetic, enthusiastic, lively, determined) |
| go-go(adjective, energetic, daring, resourceful, innovative) |
| gung ho(expression, adjective, idiom, keen, enthusiastic) |
| hard ball(expression, adjective, energetic, enthusiastic, determined) |
| harsh(hostile, belligerent, quarrelsome, authoritative, domineering) |
| high-pressure |
| hot-tempered(adjective, nasty, determined, hostile, spirited) |
| impertinent(adjective, smart, familiar, arrogant, self-assured) |
| impetuous(adjective, severe, violent, cruel, vicious) |
| incisive |
| incompatible |
| indefatigable(adjective, strong, moving, lively, active) |
| inflammatory |