| unflinching(adjective, mean, severe, heartless) |
| unforgiving(adjective, mean, severe, heartless) |
| unmerciful(adjective, vicious, fierce) |
| unpitying(adjective, mean, severe, heartless) |
| unprincipled(adjective, savage) |
| unrelenting(adjective, mean, severe, heartless) |
| unsparing(adjective, mean, severe, heartless) |
| unsympathetic(adjective, mean, severe, heartless) |
| unyielding(adjective, mean, severe, heartless) |
| vicious(adjective, fierce) |
| viciously competitive(expression, adjective, vicious, fierce, dog-eat-dog) |
| vindictive(adjective, malevolent, sadistic) |
| voracious(adjective, vicious, fierce) |
| vying(adjective, rival, ambitious, competing, contrastive) |
| wanton(adjective, mean, severe, heartless) |
| war(struggle, race, rivalry) |
| without mercy(expression, adjective, vicious, fierce, dog-eat-dog) |
| without pity(expression, adjective, malevolent, sadistic, ironfisted) |