In-sŏl'ū-ble, a.

(in-sŏl'/yū-bl), a. [Prefix in, not, and soluble; Fr. & Sp. insoluble, It. insolubile, Lat. insolubilis.]

1. Not soluble; incapable of being dissolved, particularly by a liquid; as, a substance is insoluble in water when its parts will not separate and unite with that fluid.
2. Not to be solved or explained; not to be resolved, as a doubt or difficulty; insoluble.