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mendacity

men·dac·i·ty

mendacity

 
pronunciation:
men dae sih ti
part of speech: noun
inflections: mendacities
definition 1: a tendency to lie; untruthfulness.
She was completely taken in by him at first, but she began to suspect his mendacity when his stories began to contradict each other.
antonyms:
veraciousness, veracity
definition 2: an instance of untruth; lie.
antonyms:
veraciousness, veracity