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insoluble
01
unable to be dissolved, especially in a liquid
02
admitting of no solution or explanation
03
without hope of solution
Example
The sugar remained insoluble in the cold water.
Insoluble particles floated in the undissolved solution.
Over time, the mineral became more insoluble in water.
Despite stirring, the powder remained insoluble.
The insoluble residue settled at the bottom of the container.
