different from what is usual or expected, especially in a way that is worrying, harmful, or not wanted abnormal levels of sugar in the blood They thought his behavior was abnormal. The ship was blown off course by abnormal weather conditions. opposite normal
NAmE//æbˈnɔrməli//
adverb abnormally high blood pressureSee abnormal in the Oxford Advanced Learner's DictionaryCheck pronunciation: abnormal