insoluble

Etymology

From Old French, from Latin insolubilis (in- + solubilis).

adj

1. That cannot be dissolved.
2. That cannot be solved; unsolvable; insolvable.
3. That cannot be explained; mysterious or inexplicable.
4. That cannot be broken down or dispersed.

noun

1. Any substance that cannot be dissolved.
   As there is a partial vacuum inside the drum, the liquid is sucked inside the drum and the insolubles are deposited on the outer surface of the membrane filter. 2006, Ashok Pandey, Enzyme Technology, page 518