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irregular behavior

/ɪrˈɡjʊlər ˈbɛhəvɪər/ · ir.ri.gu.lar.be.hav.ior
noun
  1. behavior that deviates from the norm or standard The company's HR department investigated the employee's irregular behavior, which included frequent tardiness and unprofessional communication.
  2. behavior that is unpredictable or erratic The patient's irregular behavior made it challenging for the doctor to diagnose their condition.
adjective
  1. not conforming to a regular pattern or standard The irregular behavior of the stock market made it difficult for investors to make informed decisions.
Did you know? The term 'irregular behavior' is often used in psychology and psychiatry to describe abnormal patterns of thought or action that deviate from the norm, and can be a symptom of various mental health conditions.
Written by Lexi Wordsworth, Dictionary Editor 1 lookups Added Aug 3, 2026