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tireless (adj.)

1590s, "indefatigable," from tire (v.) + -less. From 1862 in the sense "without a tire," from tire (n.). Related: Tirelessly.

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Definitions of tireless

tireless (adj.)
showing sustained enthusiastic action with unflagging vitality;
a tireless worker
Synonyms: indefatigable / unflagging / unwearying
tireless (adj.)
characterized by hard work and perseverance;
Synonyms: hardworking / industrious / untiring
From wordnet.princeton.edu