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English definition of “careless”

careless

adjective     /ˈkeələs/
B1 not giving enough attention to what you are doing: It was very careless of you to forget your passport . He was fined £250 for careless driving .Not paying attentionTreating as unimportantNeglecting and ignoring
carelessly adverb carelessness noun [U]
(Definition of careless adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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