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unthinking

adjective
 
 
/ʌnˈθɪŋ.kɪŋ/ formal mainly disapproving

Definition

not based on serious thought or an examination of the information: What annoys me about these people is their unthinking hostility to anything foreign or unfamiliar.Narrow-mindedNot showing careful thought unthinkingly
 
 
/-li/ adverb
I really didn't mean to offend her - I just said it unthinkingly.InconsiderateSelfishness
(Definition of unthinking adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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