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English definition of “thoughtless”

thoughtless

adjective uk   /ˈθɔːt.ləs/ us    /ˈθɑːt-/
C2 not considering how your actions or words may upset someone: It was thoughtless not to phone 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-/
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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