Etymology

inefficacy

I1N1E1F4F4I1C3A1C3Y4

Today it means: The condition of being ineffective Full definition →

English efficacy ← Old French efficace ← Late Latin efficācia
Ask AI about its historyChatGPTClaudePerplexityGoogle AIGrok

The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinin-
  5. Middle Englishin-
  6. Englishin-
  7. Late Latinefficācia
  8. Old Frenchefficace
  9. Englishefficacy
  10. English todayinefficacy

From in- + efficacy.

Etymology from Wiktionary, CC BY-SA 4.0.