pathological
path-o-log-i-cal
adjective
Unreasonable, uncontrollable, and extreme, often like a mental illness.
"He is a pathological liar."
adjective
Relating to or caused by a disease; concerning the study of pathology.
"The biopsy revealed pathological tissue changes."
Thesaurus
Synonyms: neurotic, psychoneurotic, morbid, diseased, unhealthy, pathologic