Definition of "unperceived" []

• Not perceived (adjective)

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• "The Duke watched his opportunity, slipped in unperceived, and says to the porter, 'Hallo, you sir, a pretty look-out this!' and laughed, and enjoyed the feat, as much as he did when he played the same flank-turning game in war."
• ""unperceived," says the British account, until the passage had been successfully made."
• "Agatha listened with respect, her eyes sometimes filled with tears, which she endeavoured to wipe away unperceived; but I generally found that her countenance and tone were more cheerful after having listened to the exhortations of her father."