Etymology
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pathological (adj.)

1680s, "pertaining to disease," formed in English from pathologic + -al (1). Sense of "worthy to be a subject of pathology, morbid, excessive" (as in pathological liar) is attested from 1845. Related: Pathologically.

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Definitions of pathological

pathological (adj.)
caused by or evidencing a mentally disturbed condition;
a pathological urge to succeed
a pathological liar
pathological (adj.)
caused by or altered by or manifesting disease or pathology;
pathological bodily processes
Synonyms: diseased / morbid / pathologic
pathological (adj.)
of or relating to the practice of pathology;
pathological laboratory
Synonyms: pathologic
From wordnet.princeton.edu