pathological
US /ˌpæθ.əˈlɑː.dʒɪ.kəl/
UK /ˌpæθ.əˈlɑː.dʒɪ.kəl/

1.
2.
compulsive and obsessive
:
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He was a pathological liar, unable to tell the truth even when it was in his best interest.
•
Her pathological need for control made it difficult for others to work with her.