na-adjective
irregular; not according to plan
General adjectival use for things that deviate from the norm, schedule, or expected pattern.
今日はイレギュラーな対応が多くて大変だった。
Today was tough because there were many irregular situations to handle.
noun, noun or participle which takes 'suru', intransitive verb
bad bounce (tennis)
Sports abbreviation of イレギュラーバウンド; used for an unpredictable bounce of the ball.
See also: イレギュラーバウンド
打球がイレギュラーして内野安打になった。
The batted ball took a bad hop and became an infield hit.