pathological

If something is caused by a physical or mental disease, it is pathological. Someone with a pathological compulsion for cleanliness might scrub the floors for hours every night.

Pathological comes from a Greek word, pathologikos, which means “treating of diseases” — pathos means "suffering." Anyone who studies or works with diseases, from their causes to their symptoms, identifies how the disease affects its victims, in other words, its pathological effects. Remember that this is a medical distinction. If a person has, for example, obsessive-compulsive disorder, his or her repetitive actions are pathological.

Primary Meanings of pathological

1.
adj
of or relating to the practice of pathology
2.
adj
caused by or evidencing a mentally disturbed condition
Full Definitions of pathological
1

adj of or relating to the practice of pathology

pathological laboratory”
Synonyms:
pathologic
2

adj caused by or evidencing a mentally disturbed condition

“a pathological liar”
“a pathological urge to succeed”
Synonyms:
neurotic, psychoneurotic
affected with emotional disorder

adj caused by or altered by or manifesting disease or pathology

pathological bodily processes”
Synonyms:
diseased, morbid, pathologic
unhealthy
not in or exhibiting good health in body or mind

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