na-adjective, noun which may take the genitive case particle 'no'
pathological; morbid; unhealthy; abnormal
Describes something medically diseased or figuratively abnormal and excessive, often with a negative connotation. Can modify nouns with な or の.
彼は病的なほど几帳面だ。
He is pathologically meticulous.
その症状は病的な変化を示している。
The symptoms show pathological changes.
Compound of 病 (びょう, 'illness') and 的 (てき, '-like, -ical'), forming an adjectival noun meaning 'pertaining to illness' or 'pathological'.