Insoluble
Pronunciation : In*sol"u*ble
Part of Speech : a.
Etymology : [L. insolubilis indissoluble, that can not be loosed: cf. F. insoluble. See In- not, and Soluble, and cf. Insolvable.]
Definition : 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.
3. Strong. "An insoluble wall." [Obs.] Holland
Source : Webster's Unabridged Dictionary, 1913