Etymology

undull

U1N1D2U1L1L1

Today it means: Not dull; sharp. Full definition →

Middle English undull
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undull · adjective1

  1. Middle English · inherited fromundull
  2. English todayundull

From Middle English undull, equivalent to un- (“not”) + dull.

undull · verb2

From un- + dull.

Etymology from Wiktionary, CC BY-SA 4.0.