"functioning abnormally," 1915, from dysfunction + -al (1). Related: Dysfunctionally.
Entries linking to dysfunctional
dysfunction n.
"failure to function, abnormality or impairment of function," 1914, from dys- "bad, abnormal, difficult" + function (n.). Originally in anatomy and medicine; in sociology by 1949.
-al 1
suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).