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English definition of “casual”

casual

adjective uk   /ˈkæʒ.u.əl/ us  

casual adjective (INFORMAL)

B1 describes clothes that are not formal or not suitable for special occasions: casual clothes

casual adjective (NOT INTERESTED)

not taking or not seeming to take much interest: The psychologist's attitude seemed far too casual, even brutal. Security around the conference hotel seemed almost casual. Although close to tears, she tried to make her voice sound casual.

casual adjective (TEMPORARY)

C2 [before noun] not regular or fixed: casual labour/labourers/workers casual sex

casual adjective (CHANCE)

B2 [before noun] not serious or considered, or done by chance: It was just a casual comment, I didn't mean it to be taken so seriously. To a casual observer, everything might appear normal.
casually
adverb uk   /-i/ us  
B2 She was dressed casually in shorts and a T-shirt.
(Definition of casual from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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