adjective/ireɡuˈlaɾ/
irregular, uneven, erratic, haphazard; patchy, spotty, jagged, ragged; fitful; (of a verb etc.) irregular
Antonyms: regular
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Latin rēgulāris Late Latin irrēgulārisbor. Spanish irregular Borrowed from Late Latin irrēgulāris.