| unremitting(adjective, energetic, determined, steady, regular) |
| unwearied(adjective, tireless) |
| accurate(adjective, close, complete, correct, firm) |
| assured(adjective, set, clear, strong, easy) |
| bound(adjective, strong, tough, flat, firm) |
| bulldogged(adjective, tenacious) |
| bullheaded(adjective, tough, firm, determined, resolute) |
| clear(adjective, set, complete, tough, severe) |
| continuing |
| contumacious(adjective, tough, firm, persistent, obstinate) |
| convinced(adjective, clear, certain, determined, definite) |
| deep-rooted(adjective, calm, strong, solid, steady) |
| die-hard(adjective, firm, honest, determined, unreasonable) |
| enthusiastic(adjective, complete, keen, warm, total) |
| equable(adjective, calm, strong, secure, firm) |
| fervent(adjective, clear, complete, tough, severe) |
| flinty |
| gallant(adjective, noble, bold, unconcerned, brave) |
| good(adjective, strong, honest, solid, pure) |
| hanging tough(expression, adjective, determined, usual, regular) |