Middle English

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Etymology

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hidous +‎ -ly.

Adverb

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hidously

  1. hideously
    • 14th Century, Chaucer, The Canterbury Tales, The Knight's Tale:
      The brighte swerdes wenten to and fro
      So hidously þat with þe leste strook
      That it semeþ þat it wolde felle an ook
      The bright swords went to and fro
      So hideously that with the least stroke
      That it seems that it would fell an oak