| diligent(adjective, resolute, tenacious) |
| enduring(adjective, calm, close, strong, sound) |
| heroic(adjective, vigorous, noble, courageous, fearless) |
| pertinacious(adjective, strong, tough, firm, determined) |
| purposeful(adjective, strong, tough, keen, firm) |
| rigid(adjective, set, hard, determined, resolute) |
| rugged(adjective, strong, sound, fit, solid) |
| spunky(adjective, determined, resolute, obstinate, stubborn) |
| strong-willed(adjective, firm, intense, deliberate, determined) |
| unshakable |
| unshakeable(adjective, resolute) |
| unshaken(adjective, strong, flat, firm, solid) |
| valorous(adjective, determined, vigorous, noble, resolute) |
| able-bodied(adjective, strong, sound, tough, fit) |
| adamant(adjective, strong, tough, flat, firm) |
| block(verb, stop, break, close, end) |
| close(verb, adjective, stop, break, end) |
| consistent(strong, firm, solid, certain, steady) |
| decisive(adjective, good, strong, solid, determined) |
| deliberate(adjective, intense, determined, resolute, focused) |