- insoluble⇄adv. insolubly.
- insoluble⇄insoluble, adjective.
1. that cannot be dissolved; not soluble.
Ex. Diamonds are insoluble. Fats are insoluble in water.
2. that cannot be solved; unsolvable.
Ex. The detective finally gave up, declaring the mystery insoluble. < - insoluble⇄noun insolubleness.