Difficult or impossible to solve or explain; insolvable: insoluble riddles.
[Middle English insolible, from Latin īnsolūbilis : in-, not; see in-1 + solvere, to loosen; see soluble.] in·sol'u·bil'i·ty, in·sol'u·ble·ness n., in·sol'u·ble n., in·sol'u·bly adv.
Main Entry: in·sol·u·ble Pronunciation: (')in-'säl-y&-b&l Function: adjective : incapable of being dissolved in a liquid;also: soluble only with difficulty or to a slight degree