Etymology

juvenile

ju·ven·ile
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Today it means: Young; not fully developed. Full definition →

Latin iuvenīli ← Proto-Italic *juwō ← Proto-Indo-European *h₂yéwHō
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The story

  1. Proto-Indo-European*h₂ey-
  2. Proto-Indo-European*h₂óyu
  3. Proto-Indo-European*h₂yéwHō
  4. Proto-Italic*juwō
  5. Latiniuven(is)
  6. Latiniuvenīli
  7. English todayjuvenile

Learned borrowing from Latin iuvenīlis (“youthful; juvenile”), from iuven(is) (“young”) + -īlis (“-ile”, “tending to”).

Etymology from Wiktionary, CC BY-SA 4.0.