pathological

adj. of pathology, of the study of diseases; sickly, ill

The term pathology most often refers to the study of disease: its causes, processes, development, consequences, and anatomic and functional manifestations. A field of medicine specialising in the categorization of medical diseases (as studied in the laboratory) is called Pathology. Physicians who specialise in medical laboratory pathology are called Pathologists.
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Pathological /patho·log·i·cal/ pathologic. path·o·log·i·cal or path·o·log·ic adj. 1. Of or relating to pathology. 2. [more]Pathological - Community and Resources

Adjective
1. of or relating to the practice of pathology; "pathological laboratory"
(synonym) pathologic
(pertainym) pathology
2. caused by or evidencing a mentally disturbed condition; "a pathological liar"; "a pathological urge to succeed"
(similar) neurotic, psychoneurotic
3. caused by or altered by or manifesting disease or pathology; "diseased tonsils"; "a morbid growth"; "pathologic tissue"; "pathological bodily processes"
(synonym) diseased, morbid, pathologic
(similar) unhealthy

(a.)
Of or pertaining to pathology.