| spunky(adjective, strong, tough, firm, energetic) |
| stern(adjective, appearance, severe, terrible, rigid) |
| undeviating(adjective, strong, firm, solid, certain) |
| valorous(adjective, strong, tough, firm, ready) |
| vigorous(adjective, strong, keen, solid, energetic) |
| zealous(adjective, activity, clear, tough, severe) |
| business-minded |
| committed(adjective, set, keen, firm, passionate) |
| eager(adjective, activity, clear, tough, severe) |
| enduring(adjective, calm, close, strong, secure) |
| gallant(adjective, strong, tough, firm, ready) |
| intense(adjective, clear, tough, severe, keen) |
| intractable(adjective, appearance, hard, tough, rough) |
| manly(adjective, courage, muscular, manlike) |
| mettlesome(adjective, bright, energetic, passionate, determined) |
| pig-headed(adjective, determined, obstinate, stubborn, uncompromising) |
| severe(adjective, tough, terrible, fixed, rigid) |
| steely(adjective, determined, stiff, strict, obstinate) |
| strong-minded(adjective, firm, certain, determined, significant) |
| unfailing(adjective, set, strong, firm, determined) |