Not discussed, not having been put under discussion.(adjective)
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Use "undiscussed" in a sentence
"In such a household, however, it is unwise to surmise that many books under perusal went undiscussed by the two."
"Printing is one subject that has gone largely undiscussed in the torrent of words unleashed by the iPad announcement."
"Whether the refusal to allow the Confederate states the right to self-determination, flying as it did in the face of the Declaration of Independence, was the first overt act of American imperialism is a question that goes largely undiscussed."