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thoughtless

adjective
 
 
/ˈθɔːt.ləs/ US  /ˈθɑːt-/

Definition

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.InconsiderateSelfishnessNot showing careful thought thoughtlessly
 
 
/ˈθɔːt.ləs.li/ US  /ˈθɑːt-/ adverb
thoughtlessness
 
 
/ˈθɔːt.ləs.nəs/ US  /ˈθɑːt-/ noun [U]
InconsiderateSelfishness
(Definition of thoughtless adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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