Abnormality (or dysfunctional behavior), in the vivid sense of something deviating from the normal or differing from the typical (such as an aberration), is a subjectively defined behavioral characteristic, assigned to those with rare or dysfunctional conditions.

What defines abnormal behavior?

behavior that is atypical or statistically uncommon within a particular culture or that is maladaptive or detrimental to an individual or to those around that individual.

What is the best definition of abnormal behavior?

It is a behavioral pattern that violates existing social norms and that can harm people. ... It consists of behavior patterns that go against prevailing social or cultural norms. It is a rare or irregular manner in which a person acts.