| Rating | Solver | Clue |
|---|---|---|
| UNTIRING | Indefatigable | |
| INFATIGABLE | Indefatigable. | |
| UNDEFATIGABLE | Indefatigable. | |
| INDEFATIGABILITY | The state of being indefatigable. | |
| INDEFATIGABLENESS | Indefatigable quality; unweariedness; persistency. | |
| UNWEARIED | Not wearied; not fatigued or tired; hence, persistent; not tiring or wearying; indefatigable. | |
| INDEFATIGABLE | Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application. | |