from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Having or showing a capacity for persistent effort; not tiring or relenting.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Untiring.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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


Sorry, no etymologies found.



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