Etymology

infidelity

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Today it means: Unfaithfulness in a marriage or an intimate (sexual or romantic) relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse. Full definition →

Middle English infidelite ← Middle French infidelité ← Latin īnfidēlitās
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The story

  1. Latin · derived fromīnfidēlitās
  2. Middle French · derived frominfidelité
  3. Middle English · inherited frominfidelite
  4. English todayinfidelity

From Middle English infidelite, from Middle French infidelité (modern French infidélité) and its etymon Latin īnfidēlitās. Equivalent to infidel + -ity.

Etymology from Wiktionary, CC BY-SA 4.0.