| wilful(adjective, determined, resolute, uncompromising, unshakeable) |
| work well under pressure |
| acrimonious(adjective, severe) |
| acute(adjective, severe) |
| antisocial(shy, unfriendly) |
| astringent(adjective, close, strong, hard, tough) |
| authoritarian(adjective, strong, hard, tough, severe) |
| bleak(adjective, severe) |
| bound(adjective, strong, flat, firm, harsh) |
| brittle(adjective, hard, firm, solid, rigid) |
| bull-headed(adjective, determined, resolute, obstinate, stubborn) |
| cast-iron(inflexible, intent, hard-and-fast) |
| caustic(adjective, severe) |
| certain(adjective, determined, limited, definite, inflexible) |
| chilly(adjective, cool, severe, cold, detached) |
| committed(adjective, resolute, persistent, dedicated, unwavering) |
| crisp(adjective, severe) |
| critical(adjective, severe) |
| dead set on(expression, adjective, idiom, strong, flat) |
| dedicated(adjective, clear, tough, severe, determined) |