A quirk, idiosyncrasy, or mannerism; an unusual habit that is slightly strange or silly.
A weakness or failing of character.
Part of a sword between the middle and the point, weaker than the forte.
An object or event that is not regular or ordinary.
A violation of rules.
An instance of being irregular.
Irregular bowel movement (e.g. diarrhea or constipation).
The state or condition of being irregular, or the extent to which something is irregular.