| unafraid(adjective, strong, tough, ready, determined) |
| unwearied(adjective, strong, firm, energetic, determined) |
| adventurous(adjective, strong, bold, spirited, brave) |
| assertive |
| assured(verb, adjective, strong, tough, easy) |
| bullheaded(adjective, tenacious) |
| certain(adjective, strong, easy, firm, solid) |
| changeless(adjective, firm, solid, stable, fixed) |
| dependable(adjective, close, correct, firm, honest) |
| doughty(adjective, strong, tough, firm, bold) |
| peremptory(adjective, resolution) |
| rapt(adjective, fixed, absorbed, concentrated, focused) |
| red-blooded(adjective, strong, vigorous, noble, bold) |
| sedulous |
| stout-hearted(adjective, vigorous, noble, courage, courageous) |
| stouthearted(strong, tough, solid, determined, bold) |
| unconquerable |
| undiscouraged(adjective, bold, unconcerned, brave, steadfast) |
| unmoved(adjective, cold, indifferent, impassive, unaffected) |
| weariless(adjective, tireless) |