thoughtless Definition in the Cambridge English Dictionary
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Definition of “thoughtless” - English Dictionary

Definition of "thoughtless" - American English Dictionary

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thoughtlessadjective

 us   /ˈθɔt·ləs/
not ​showingcare 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 ​unkindremark about her ​mother.
(Definition of thoughtless from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "thoughtless" - British English Dictionary

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thoughtlessadjective

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