Definition of thoughtlessly adverb from the Oxford Advanced Learner's Dictionary

 

thoughtlessly

 adverb
adverb
BrE BrE//ˈθɔːtləsli//
 
; NAmE NAmE//ˈθɔːtləsli//
 
(disapproving)
 
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in a way that shows that you do not care about the possible effects of your words or actions on other people synonym inconsiderately He had behaved thoughtlessly and selfishly.