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English definition of “subtle”

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subtle

adjective uk   /ˈsʌt.əl/ us    /ˈsʌt̬-/ approving
C2 not loud, bright, noticeable, or obvious in any way: The room was painted a subtle shade of pink. The play's message is perhaps too subtle to be understood by young children. small but important: There is a subtle difference between these two plans.C2 achieved in a quiet way that does not attract attention to itself and is therefore good or clever: a subtle plan/suggestion subtle questions
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subtly
adverb uk   /-li/ us  
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This discovery had subtly changed/altered the way I thought about myself.
(Definition of subtle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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