LATIN DICTIONARYLexicon Latīnum
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“irregularity” in Latin

The English word irregularity itself goes back to Latin rēgulāris, through irregularitas.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

irregularity
enormitas (Sen., Const., 18, 1): inconstantia (unsteadiness, inconsistency; mentis, Cic.): minus apta compositio (want of symmetrical arrangement; of the body): anomalia (in declension or conjugation; explained by Gell., inaequalitas conjugationum).

Quick answer

What is the Latin word for irregularity?
The usual Latin words for “irregularity” are ēnormitās, incōnstāns, anōmalia; also mēns. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.