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Use "undissolved" in a sentence
"You could put as many in the tea as you liked with no evident sweetening, due to the undissolved sugar at the bottom of the icy glass."
"It is important to remember that multivitamins with iron contain a smaller quantity of elemental iron and are therefore, less radiopaque than preparations such as ferrous sulfate and that partially dissolved tablets will not be as radiopaque as undissolved tablets."
"Please Note: It isvery important that when you transfer the heated solution to the container in which you cool it, you must leave any undissolved crystals behind."