Etymology

untiring

un·tir·ing
U1N1T1I1R1I1N1G2

Today it means: Not able to be tired; inexhaustible, tireless. Full definition →

English tiring ← Middle English un- ← Old English un-
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untiring · adjective1

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Germanic*un-
  4. Proto-West Germanic*un-
  5. Old Englishun-
  6. Middle Englishun-
  7. Englishun-
  8. Englishtiring
  9. English todayuntiring

From un- (prefix meaning ‘not’) + tiring (“that tire or tires”, adjective).

untiring · verb2

  1. Proto-Indo-European*h₂ent-
  2. Proto-Indo-European*h₂énts
  3. Proto-Germanic*anda-
  4. Proto-West Germanic*anda-
  5. Old Englishand-
  6. Old Englishon-
  7. Middle Englishon-
  8. Englishun-
  9. Proto-West Germanic*teuʀōn
  10. Old Englishtēorian
  11. Middle Englishtiren
  12. Englishtire
  13. Englishuntire
  14. English todayuntiring

From untire (verb) + -ing (suffix forming present participles of verbs).

Etymology from Wiktionary, CC BY-SA 4.0.