INDEFATIGABLE

INDEFATIGABLE(adj): never giving up or getting tired of doing something.

Synonyms- Inexhaustible, tireless, unflagging, untiring, weariless, energetic, active, conscientious

Antonyms- exhaustible, weary, lethargic, fatigued, tired, sluggish, drained

Sentence usage- The Techouse Library offers an indefatigable array of services to its beneficiaries.

Phrase- tirelessly persistent.

Idiom- going the extra mile.