Definition of thoughtless adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈθɔːtləs//
; NAmE NAmE//ˈθɔːtləs//
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not caring about the possible effects of your words or actions on other people synonym inconsiderate a thoughtless remarkExtra examples It was thoughtless of him to take the car without checking first. It was thoughtless to spring it on you so suddenly. There could be a serious accident as a result of their thoughtless actions.
See the Oxford Advanced American Dictionary entry: thoughtless