Etymology

senseless

sense·less
S1E1N1S1E1L1E1S1S1

Today it means: Without feeling or desire to work; deprived of sensation. Full definition →

Proto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English sense
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The story

  1. Proto-Indo-European*sent-
  2. Proto-Italic*sentiō
  3. Latinsentiō
  4. Latinsēnsu
  5. Proto-Germanic*sinnaz
  6. Frankish*sinn
  7. Vulgar Latin*sennus
  8. Old Frenchsens
  9. Middle Englishsense
  10. Englishsense
  11. Proto-Indo-European*lewh₁-
  12. Proto-Indo-European*lewHs-
  13. Proto-Germanic*leusaną
  14. Proto-Germanic*lausaz
  15. English todaysenseless

From sense + -less. Compare Saterland Frisian sinloos (“senseless, foolish”).

Etymology from Wiktionary, CC BY-SA 4.0.