careless Definition in Cambridge British English Dictionary
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Definition of "careless" - British English Dictionary

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carelessadjective

uk   /ˈkeə.ləs/  us   /ˈker-/

careless adjective (NO ATTENTION)

B1 not taking or showing enough care and attention: My son's teacher says that his work is often rather careless. He made a careless remark (= one made without thinking) about her appearance that really upset her.
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careless adjective (NO WORRY)

literary relaxed, natural, and free from worry
See also
carelessly
adverb uk   us   /-li/
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B2 He told me off for driving carelessly.
carelessness
noun [U] uk   us   /-nəs/
(Definition of careless from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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