| inured(adjective, hard, careless, indifferent, cruel) |
| iron-willed(adjective, determined, resolute, uncompromising, unshakeable) |
| lost |
| puritanical(adjective, severe) |
| rebellious(adjective, tough, firm, unreasonable, grim) |
| reprobate(vice, shameless) |
| rock-ribbed(adjective, determined, resolute, uncompromising, unshakeable) |
| savage(adjective, mean, hard, rough, harsh) |
| solid |
| strait-laced(adjective, severe, severity) |
| strong(adjective, hard, tough, flat, firm) |
| tireless(adjective, tenacious) |
| tyrannical(adjective, severity) |
| unappeasable(adjective, mean, harsh, cruel, determined) |
| uncaring(adjective, mean, hard, cool, tough) |
| undeviating(adjective, strong, flat, harsh, certain) |
| unflinching(adjective, strong, flat, harsh, certain) |
| unmoved(adjective, mean, hard, cool, unpleasant) |
| unruly(tough, difficult, wild, obstinate, stubborn) |
| aloof(adjective, mean, hard, cool, tough) |