noun (n)

• behavior that breaches the rule or etiquette or custom or morality(noun.act)

  Synonym:
  abnormality
  

  source: wordnet30
• not characterized by a fixed principle or rate; at irregular intervals(noun.attribute)

  Synonym:
  unregularity
  Antonym:
  regularity
  

  source: wordnet30
• an irregular asymmetry in shape; an irregular spatial pattern(noun.attribute)

  Synonym:
  geometrical irregularity
  

  source: wordnet30
• irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis(noun.state)

  Synonym:
  constipation
  

  source: wordnet30
• The state or quality of being irregular; that which is irregular.(noun)

  source: webster1913