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Definition of unwearied : Not wearied; not fatigued or tired; hence, persistent; not tiring or wearying; indefatigable.

Synonyms:

tireless, untired, continue, unfailing, unflagging, inexhaustible, unweary, tired, rested, untiring, weariless, indefatigable

Usage examples:

• In spite of the unwearied activity of Shalmanesar, in spite of his ceaseless campaigns and the important results gained by his weapons, his reign ended amid domestic troubles, caused by a rebellion of the native land. - "The History of Antiquity, Vol. II (of VI)", Max Duncker.
• He was unwearied in the study of nature in her various aspects. - "Self Help", Samuel Smiles.
• Yes, in some far- shining sphere, Conscious or not of the past, Still thou performest the word Of the Spirit in whom thou dost live- Prompt, unwearied, as here! - "The Ontario Readers: The High School Reader, 1886", Ministry of Education.