In*sol"u*ble (?), a. [L. insolubilis indissoluble, that can not be
loosed: cf. F. insoluble. See In- not, and Soluble, and cf.
Insolvable.]
1. Not soluble; in capable or difficult of being dissolved, as by a
liquid; as, chalk is insoluble in water.
2. Not to be solved or explained; insolvable; as, an insoluble doubt,
question, or difficulty.