Definition of “thoughtless” - English Dictionary

“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 Learner's Dictionary & Thesaurus © Cambridge University Press)

“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)