| assiduous(adjective, persistent, continuous) |
| unwearied(adjective, strong, continue, firm, energetic) |
| diligent(adjective, persistent, persevering, tenacious) |
| energetic(adjective, determined, active, vigorous, full) |
| fixed(adjective, persistent) |
| inexhaustible(adjective, strong, continue, firm, energetic) |
| obstinate(adjective, tenacious) |
| persisting(adjective, continuous) |
| undeviating(adjective, persistent, perseverance) |
| unremitting(adjective, strong, firm, energetic, determined) |
| faithful(adjective, firm, certain, cheerful, comfortable) |
| firm(adjective, strong, tough, fit, solid) |
| industrious(adjective, strong, difficult, energetic, lively) |
| loyal(adjective, strong, firm, certain, constant) |
| undaunted(adjective, tenacious) |
| unflinching(adjective, set, strong, firm, energetic) |
| dynamic(adjective, strong, moving, lively, active) |
| enduring(adjective, set, strong, steady, constant) |
| indomitable(adjective, strong, firm, determined, steady) |
| pertinacious(adjective, strong, firm, energetic, determined) |