| convinced(adjective, clear, certain, definite, unquestionable) |
| definite(adjective, clear, complete, firm, total) |
| immovable(adjective, firm, solid, stable, fixed) |
| industrious |
| inexhaustible(adjective, strong, firm, energetic, determined) |
| inflexible(adjective, strong, firm, certain, limited) |
| permanent |
| persuaded(adjective, clear, certain, definite, unquestionable) |
| proud |
| regular(adjective, firm, solid, steady, stable) |
| rigid(adjective, intense, resolute, persistent, unqualified) |
| solid(adjective, firm, steady, stable, fixed) |
| strong(adjective, firm, determined, steady, bold) |
| strong-willed(adjective, firm, intense, deliberate, determined) |
| trusty(adjective, reliable, steadfast, loyal, faithful) |
| unblinking(adjective, certain, limited, definite, inflexible) |
| unremitting(adjective, strong, firm, energetic, determined) |
| unshrinking(adjective, bold, unconcerned, brave, steadfast) |
| unsleeping(adjective, perseverance) |
| vigorous |