Etymology

mentally

men·tal·ly
M3E1N1T1A1L1L1Y4

Today it means: In a mental manner; an idea thought out in one's mind, as opposed to an idea spoken orally. Full definition →

Proto-Germanic *līką ← Proto-Indo-European *leyg- ← English mental
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The story

  1. Proto-Indo-European*men-
  2. Proto-Indo-European*méntis
  3. Proto-Italic*mentis
  4. Latinmēns
  5. Proto-Indo-European*h₂el-
  6. Proto-Indo-European*h₂élisder.?
  7. Late Latinmentāli
  8. Middle Frenchmenta
  9. Englishmental
  10. Proto-Indo-European*leyg-
  11. Proto-Germanic*līką
  12. English todaymentally

From mental + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.