Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not yielding to fatigue; untiring or indefatigable.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Indefatigable, untiring and not yielding to fatigue
  • adj. Without a tire (wheel covering); tyreless.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Untiring.

from The Century Dictionary and Cyclopedia

  • Not tiring or becoming tired; not yielding to fatigue; untiring; unwearying.
  • Without a tire: as, a tireless wheel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. characterized by hard work and perseverance
  • adj. showing sustained enthusiastic action with unflagging vitality

Etymologies

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