If events or actions occur at irregular intervals, the periods of time between them are of different lengths.
Cars passed at irregular intervals.
有汽车断断续续地驶过。
She was taken to a hospital suffering from an irregular heartbeat.
她因心律不齐而被送进医院。
He worked irregular hours.
他的工作时间没有规律。
Irregular behaviour is dishonest or not in accordance with the normal rules.
irregular business practices.
不正当的商务活动。
An irregular verb, noun, or adjective has different forms from most other verbs, nouns, or adjectives in the language. For example, 'break' is an irregular verb because its past form is 'broke', not 'breaked'.