abnormality, irregularity -- (behavior that breaches the rule or etiquette or custom or morality)
irregularity, unregularity -- (not characterized by a fixed principle or rate; at irregular intervals)
irregularity, geometrical irregularity -- (an irregular asymmetry in shape; an irregular spatial pattern)
constipation, irregularity -- (irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis)