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.
He sometimes shows an obsessive, unhealthy attachment.
He is pathologically meticulous.
The symptoms show pathological changes.
She keeps washing her hands to an obsessive, unhealthy degree.
正常 means 'normal' or 'healthy', the direct opposite of the diseased or excessive state described by 病的.
Compound of 病 (びょう, 'illness') and 的 (てき, '-like, -ical'), forming an adjectival noun meaning 'pertaining to illness' or 'pathological'.