Etymology

innocuous

in·noc·u·ous
I1N1N1O1C3U1O1U1S1

Today it means: Harmless; producing no ill effect. Full definition →

Latin innocuus
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The story

  1. Latin · borrowed frominnocuus“harmless”
  2. English todayinnocuous

From Latin innocuus (“harmless”) (therefore, no gemination in + nocuous).

Etymology from Wiktionary, CC BY-SA 4.0.