Used in medical, psychological, or figurative contexts to describe something abnormal, diseased, or compulsive.
彼の行動は病理的だと言われている。
His behavior is said to be pathological.
病理的な変化が細胞に見られた。
Pathological changes were observed in the cells.
Compound of 病理 (pathology) + 的 (-like, -ical), forming an adjectival noun meaning 'pathological'.