/dɪsˈfʌŋkʃənəl/
adjective
Dysfunctional is used to describe relationships or behaviour which are different from what is considered to be normal.
noun
dysfunction
(medical 医学) the fact of a part of the body not working normally （身体）功能障碍
He’s suffering from sexual dysfunction caused by depression.
他因抑郁而患上性功能障碍。