pathological

US /ˌpæθ.əˈlɑː.dʒɪ.kəl/
UK /ˌpæθ.əˈlɑː.dʒɪ.kəl/
"pathological" picture
1.

relating to or caused by disease; morbid

:
The doctor ordered further tests to determine the pathological changes in the tissue.
Her fear of germs was almost pathological.
2.

compulsive and obsessive

:
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.