The meaning of ABNORMAL is deviating from the normal or average; often : unusual in an unwelcome or problematic way. How to use abnormal in a sentence.

ABNORMAL definition: not normal, average, typical, or usual; deviating from a standard. See examples of abnormal used in a sentence.

ABNORMAL definition: 1. different from what is usual or average, especially in a way that is bad: 2. different from…. Learn more.

Someone or something that is abnormal is unusual, especially in a way that is worrying.

Something that is abnormal is out of the ordinary, or not typical. Abnormal is a combination of the Latin prefix ab which means “away from,” and the English word normal.

abnormal (æbˈnɔːməl) adj 1. not normal; deviating from the usual or typical; extraordinary 2. informal odd in behaviour or appearance; strange

Definition of abnormal adjective from the Oxford Advanced Learner's Dictionary. different from what is usual or expected, especially in a way that worries somebody or is harmful or not wanted. They …

abnormal meaning, definition, what is abnormal: very different from usual in a way that ...: Learn more.

Nov 19, 2025 · abnormal (comparative more abnormal, superlative most abnormal) Not conforming to rule or system; deviating from the usual or normal type. [First attested around the mid 19th …

Britannica Dictionary definition of ABNORMAL [more abnormal; most abnormal] : different from what is normal or average : unusual especially in a way that causes problems abnormal behavior