| tenacious(adjective, strong, firm, determined, steady) |
| inexhaustible(adjective, strong, continue, firm, energetic) |
| steady(adjective, strong, firm, determined, resolute) |
| unswerving(adjective, set, strong, firm, determined) |
| unwearied(adjective, strong, continue, firm, energetic) |
| vigorous(adjective, strong, energetic, lively, determined) |
| firm(adjective, strong, determined, steady, resolute) |
| hardworking |
| stubborn(adjective, resolute, tenacious) |
| busy(adjective, active) |
| constant(adjective, strong, firm, determined, steady) |
| dynamic(adjective, strong, moving, energetic, lively) |
| enthusiastic(adjective, determined, active, peppy, bouncing) |
| hard-working(adjective, work, strain, determined, firmness) |
| loyal(adjective, resolute) |
| resolved(adjective, resolute) |
| spirited(adjective, strong, moving, energetic, lively) |
| strenuous(adjective, strong, difficult, energetic, lively) |
| eager(adjective, determined, active) |
| lively(adjective, strong, moving, energetic, active) |