1 not having a shape or pattern that we recognize or can predict 不规则的;无规律的:
an irregular shape不规则的形状
2 happening at times that you cannot predict 不定期的:
His visits became more and more irregular.他的探视越来越不定期了。
3 not allowed according to the rules or social customs 不合规矩的;不合常规的:
It is highly irregular for a doctor to give information about patients without their permission.医生未经病人同意把他们的资料公开是不合规矩的。
4 (grammar语法) not following the usual rules of grammar 不规则变化的:
irregular verbs不规则动词‘Caught’ is an irregular past tense form.caught是不规则变化的过去时形式。 [OPP] for senses 1, 2 and 4regular 第1、2及4义的反义词皆为regular