| dependable(adjective, close, correct, firm, honest) |
| indomitable(adjective, strong, firm, determined, steady) |
| pertinacious(adjective, strong, firm, determined, steady) |
| stalwart(adjective, calm, strong, secure, firm) |
| strong(adjective, calm, flat, firm, solid) |
| consistent(adjective, set, strong, smooth, flat) |
| immutable(adjective, calm, set, strong, solid) |
| permanent(adjective, calm, strong, firm, solid) |
| sturdy(adjective, calm, strong, secure, firm) |
| tough(adjective, calm, strong, secure, firm) |
| unfailing(adjective, set, clear, strong, firm) |
| unhesitating(adjective, firm, certain, serious, resolute) |
| uniform(adjective, calm, strong, secure, smooth) |
| assiduous |
| courageous(adjective, resolute) |
| decisive(adjective, firm, certain, determined, serious) |
| diligent(adjective, resolute) |
| hard-nosed(adjective, determined, resolute, obstinate, uncompromising) |
| intent(adjective, strong, flat, firm, intense) |
| secure(verb, adjective, calm, strong, firm) |