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English to English adjective
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Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application. |  | source: webster1913
adjective satellite
| 2 |
showing sustained enthusiastic action with unflagging vitality | | Example: an indefatigable advocate of equal rights
a tireless worker
unflagging pursuit of excellence
source: wordnet30
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