Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

behavior that is unlike the majority of a healthy human population- behaviors which could pose a threat to one's livelihood or well-being. Frequently, abnormal behavior is viewed as being symptomatic of underlying problems ranging from emotional traumas to mental illness.

ABNORMAL BEHAVIOR: "Andrew's abnormal behavior was disturbing enough to warrant a mental health examination prompted by his parents."

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