Etymology

doubtful

doubt·ful
D2O1U1B3T1F4U1L1

Today it means: Subject to, or causing doubt. Full definition →

Middle English doutfull
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The story

  1. Middle English · inherited fromdoutfull
  2. English todaydoubtful

From Middle English doutfull, douteful, equivalent to doubt + -ful.

Etymology from Wiktionary, CC BY-SA 4.0.