Etymology

undoubtably

U1N1D2O1U1B3T1A1B3L1Y4

Today it means: Without doubt. Full definition →

Middle English undoutably
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The story

  1. Middle English · inherited fromundoutably
  2. English todayundoubtably

From Middle English undoutably, equivalent to undoubtable + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.