misbehave v. + Add to list US //ˌmɪsbəˈheɪv// UK //mɪsbɪhˈeɪv// mis·be·have SynonymsAntonymsEtymology Synonyms misconductmisdemean Antonyms behaveOriginMEmisbehaven→ENmisbehave From Middle English misbehaven, equivalent to mis- + behave.