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1. Oxford Dictionary

   imperceptible

   • IPA[ˌɪmpəˈsɛptɪbl]

   英式

   • adj.
     so slight, gradual, or subtle as not to be perceived
2. • 釋義

   adj.

   形容詞

   • 1. so slight, gradual, or subtle as not to be perceived his head moved in an almost imperceptible nod