Meaning of IRREGULAR in English
If events or actions occur at ~ intervals, the periods of time between them are of different lengths.
Cars passed at ~ intervals...
He worked ~ hours.
He was eating ~ly, steadily losing weight.
ADV: ADV with v
...a dangerous ~ity in her heartbeat.
Something that is ~ is not smooth or straight, or does not form a regular pattern.
He had bad teeth, ~ and discolored.
Located off-center in the ~ly shaped lake was a fountain.
ADV: usu ADV -ed
...treatment of abnormalities or ~ities of the teeth.
Irregular behaviour is dishonest or not in accordance with the normal rules.
...the minister accused of ~ business practices...
...charges arising from alleged financial ~ities.
An ~ verb, noun, or adjective has different forms from most other verbs, nouns, or adjectives in the language. For example, ‘break’ is an ~ verb because its past form is ‘broke’, not ‘breaked’.
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012