Etymology

no doubt

Today it means: without a doubt; surely. Full definition →

Middle English ne doute ← Old French saunz doute
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The story

  1. Old French · calque ofsaunz doute
  2. Middle English · inherited fromne doute
  3. English todayno doubt

Inherited from Middle English ne doute, a calque of Old French saunz doute, itself borrowed unadapted into Middle English.

Etymology from Wiktionary, CC BY-SA 4.0.