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[uhn-trooth-fuh l] /ʌnˈtruθ fəl/
not truthful; wanting in veracity; diverging from or contrary to the truth; not corresponding with fact or reality.
Origin of untruthful
Middle English word dating back to 1325-75; See origin at un-1, truthful
Related forms
untruthfully, adverb
untruthfulness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for untruthful
Contemporary Examples
Historical Examples
  • Ah, then you admit you were untruthful when you said you laughed because you saw me?

  • Nature is real, and why should man alone be untruthful and unreal?

    A Day's Ride Charles James Lever
  • There can be no question that he was idle, untruthful, and unreliable.

    A Great Man Arnold Bennett
  • I had no idea how insolent and untruthful these half-castes were.

    'Twixt Land & Sea Joseph Conrad
  • And my opinion is that you are as uncivil as I've proved you to be untruthful.

    The Rescue Joseph Conrad
British Dictionary definitions for untruthful


(of a person) given to lying
diverging from the truth; untrue
Derived Forms
untruthfully, adverb
untruthfulness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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