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Use "unperceived" in a sentence
"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."