Definition of indefatigable:
showing sustained enthusiastic action with unflagging vitality
Synonyms of indefatigable:
tireless, unflagging, unwearying, persistent, untiring, persevering, dogged, steadfast, determined, unfaltering, energetic, diligent
Opposite/Antonyms of indefatigable:
lazy, weary, work-shy, tired, lethargic, idle, fatigued, clean, clear, indolent, shiftless
Sentence/Example of indefatigable:
The fame of Claude Lorraine is partly explained by his indefatigableindustry.