| plucky(adjective, determined, resolute, brave, courageous) |
| scrupulous(adjective, thorough, meticulous, painstaking) |
| serious(adjective, strong, firm, determined, resolute) |
| strong-minded(adjective, firm, determined, resolution, serious) |
| tolerating(verb, abiding) |
| tough(adjective, firm, determined, unreasonable, grim) |
| unchangeable(adjective, strong, certain, definite, resolute) |
| unremitting(adjective, strong, firm, determined, steady) |
| unwearying |
| active(adjective, activity, keen, difficult, energetic) |
| conscientious(adjective, thorough, meticulous, painstaking) |
| dauntless(adjective, resolute, tenacious) |
| exact(adjective, thorough, meticulous, painstaking) |
| immutable |
| intransigent |
| punctilious(adjective, thorough, meticulous, painstaking) |
| remaining(verb, adjective, abiding) |
| ruthless(adjective, resolute) |
| self-willed(adjective, tough, firm, unreasonable, grim) |
| spunky(adjective, resolute, tenacious) |