Etymology

light-minded

Today it means: Not given to heavy thoughts or thinking, frivolous, not serious. Full definition →

English minded ← Middle English light ← Old English lēoht
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The story

  1. Proto-Indo-European*h₁lengʷʰ-
  2. Proto-Germanic*linhtaz
  3. Proto-West Germanic*lį̄ht
  4. Old Englishlēoht
  5. Middle Englishlight
  6. Englishlight
  7. Englishmind
  8. Englishminded
  9. English todaylight-minded

From light (“lacking mental gravity”, adjective) + minded (“having a mind or inclination”, adjective).

Etymology from Wiktionary, CC BY-SA 4.0.