Definition of unthinking adjective from the Oxford Advanced American Dictionary

 

unthinking

 adjective
adjective
NAmE//ʌnˈθɪŋkɪŋ//
 
(formal)
 
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not thinking about the effects of what you do or say; not thinking much about serious things synonym thoughtless
unthinkingly
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: unthinking