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irregular

adjective (RULE)
 
 
/ɪˈreɡ.jə.lər/ US  /-lɚ/

Definition

formal (of behaviour or actions) not according to usual rules or what is expected: Releasing the goods without an invoice is most irregular.Wrong B1 In grammar, an irregular verb, noun, adjective, etc. does not obey the usual rules for words in the language.Linguistic terms and linguistic style irregularly
 
 
/-li/ adverb
irregularly shaped The verb acts irregularly.Rough, irregular and unevenLinguistic terms and linguistic styleFrequency and regularity - general words
(Definition of irregular adjective (RULE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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