Meaning of “pathological” - Learner’s Dictionary

pathological

adjective uk us /ˌpæθəˈlɒdʒɪkəl/
NO CONTROL

Pathological behaviour or feelings are extreme and cannot be controlled:

a pathological liar
pathological hatred
DISEASE

relating to pathology (= the study of disease)

(Definition of “pathological” from the Cambridge Learner’s Dictionary © Cambridge University Press)