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English definition of “subtle”

subtle

adjective     /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.Indistinct and invisible small but important: There is a subtle difference between these two plans.Very important or urgent C2 achieved in a quiet way that does not attract attention to itself and is therefore good or clever: a subtle plan/suggestion subtle questionsIntelligencePerceptive subtly     /-li/ adverb This discovery had subtly changed/altered the way I thought about myself.IntelligencePerceptive
(Definition of subtle adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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