Etymology

tireless

T1I1R1E1L1E1S1S1

Today it means: Indefatigable, untiring and not yielding to fatigue Full definition →

Proto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English tire
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tireless · adjective1

  1. Englishtire
  2. Proto-Indo-European*lewh₁-
  3. Proto-Indo-European*lewHs-
  4. Proto-Germanic*leusaną
  5. Proto-Germanic*lausaz
  6. English todaytireless

From tire (“to become sleepy or weary”) + -less.

tireless · adjective2

  1. Proto-West Germanic*teuʀōn
  2. Old Englishtēorian
  3. Middle Englishtiren
  4. Englishtire
  5. Proto-Indo-European*lewh₁-
  6. Proto-Indo-European*lewHs-
  7. Proto-Germanic*leusaną
  8. Proto-Germanic*lausaz
  9. English todaytireless

From tire + -less.

Etymology from Wiktionary, CC BY-SA 4.0.