Etymology

unacceptable

U1N1A1C3C3E1P3T1A1B3L1E1

Today it means: Unsatisfactory; not acceptable. Full definition →

Middle English unacceptabylle
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The story

  1. Middle English · inherited fromunacceptabylle
  2. English todayunacceptable

From Middle English unacceptabylle, equivalent to un- + acceptable.

Etymology from Wiktionary, CC BY-SA 4.0.