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Definition of “thoughtless” - English Dictionary

"thoughtless" in American English

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thoughtlessadjective

us   /ˈθɔt·ləs/
not showing care for others: I’m sorry I was late – it was thoughtless of me not to call.
thoughtlessly
adverb us   /ˈθɔt·ləs·li/
He thoughtlessly made an unkind remark about her mother.
(Definition of thoughtless from the Cambridge Academic Content Dictionary © Cambridge University Press)







"thoughtless" in British English

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thoughtlessadjective

uk   /ˈθɔːt.ləs/ us   /ˈθɑːt.ləs/
C2 not considering how your actions or words may upset someone: It was thoughtless not to call and say you'd be late. She's not intentionally unkind - she's just a little thoughtless sometimes.
thoughtlessly
adverb uk   /ˈθɔːt.ləs.li/ us   /ˈθɑːt.ləs.li/
thoughtlessness
noun [U] uk   /ˈθɔːt.ləs.nəs/ us   /ˈθɑːt.ləs.nəs/
(Definition of thoughtless from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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