Ir-rĕg'ū-lar1, a.
a. [Prefix in, not, and regular; Pr. & Sp. irregular, It. irregolare, Fr. irrégulier.]
Sense 1. Not regular; not according to common form or rules; as, an irregular building or fortification.
Sense 2. Not according to established principles or customs; deviating from usage; as, the irregular proceedings of a legislative body.
Sense 3. Not conformable to nature or the usual operation of natural laws; as, an irregular action of the heart and arteries.
Sense 4. Not according to the rules of art; immethodical; as, irregular verse; an irregular discourse.
Sense 5. Not in conformity to laws, human or divine; deviating from the rules of moral rectitude; vicious; as, irregular conduct or propensities.
Sense 6. Not straight; as, an irregular line or course.
Sense 7. Not uniform; as, irregular motion.
Sense 8. (Gram.) Deviating from the ordinary form in respect to the inflectional terminations;—said of words subject to inflection.
Sense 9. (Bot.) Not having the parts of the same size or form, or arranged with symmetry; not symmetrical; as, the petals of a labiate flower are irregular.
Synonyms— Immethodical; unsystematic; abnormal; anomalous; erratic; devious; eccentric; crooked; unsettled; variable; changeable; mutable; desultory; disorderly; wild; immoderate; intemperate; inordinate; vicious.