tireless synonyms

tireless

modif.

unwearied, unwearying, untiring, indefatigable, unflagging, incessant, hard-working, strenuous, energetic, resolute, steadfast, persevering; see also active 2, enthusiastic 1, 3.

Antonyms tired*, weak*, listless.

Webster's New World Roget's A-Z Thesaurus Copyright © 1999 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.