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Use "undiscernible" in a sentence
"Scene where Negro servant sends Larkin back for soldiers so light it is undiscernible. . ."
"All the undiscernible difficulties and dangers he had ever feared were closing in, when he could not stir hand or foot."
"Perhaps his lifelong constraint towards women, which he had attributed to accident, was not chance after all, but the natural result of instinctive acts so minute as to be undiscernible even by himself."