Insoluble vs. Undissolvable: What's the Difference?

That cannot be dissolved

Not dissolvable

Difficult or impossible to solve or explain; insolvable

That cannot be dissolved.

That cannot be solved; unsolvable; insolvable.

That cannot be explained; mysterious or inexplicable.

That cannot be broken down or dispersed.

Any substance that cannot be dissolved.

Not soluble; in capable or difficult of being dissolved, as by a liquid; as, chalk is insoluble in water.

Not to be solved or explained; insolvable; as, an insoluble doubt, question, or difficulty.

Strong.

(of a substance) not easily dissolved

Admitting of no solution or explanation;

Without hope of solution;