Etymology

thoughtless

T1H4O1U1G2H4T1L1E1S1S1

Today it means: Marked by or showing lack of due thought or care. Full definition →

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

  1. Proto-Indo-European*teng-
  2. Proto-Germanic*þankijaną
  3. Proto-Germanic*þanhtaz
  4. Proto-West Germanic*þą̄ht
  5. Old Englishþōht
  6. Middle Englishthought
  7. Englishthought
  8. Proto-Indo-European*lewh₁-
  9. Proto-Indo-European*lewHs-
  10. Proto-Germanic*leusaną
  11. Proto-Germanic*lausaz
  12. English todaythoughtless

From thought + -less.

Etymology from Wiktionary, CC BY-SA 4.0.