Etymology

truthless

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Today it means: Lacking truth, untruthful. Full definition →

Middle English trewðeleas
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The story

  1. Middle English · inherited fromtrewðeleas
  2. English todaytruthless

From Middle English trewðeleas, equivalent to truth + -less. Piecewise doublet of trothless.

Etymology from Wiktionary, CC BY-SA 4.0.