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pathological liar

[ path-uh-loj-i-kuhl lahy-er ]
/ ˈpæθ əˌlɒdʒ ɪ kəl ˈlaɪ ər /
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noun
a person who tells lies frequently, with no rational motive for doing so.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use pathological liar in a sentence

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