Insoluble (adjective)

Not able to be dissolved; incapable of being solved or resolved.

Origin:

Insoluble is derived from the latin word "insolubilis" meaning not capable of being dissolved.

Examples:

1. The problem was deemed insoluble and the team had to come up with a new approach.
2. The dispute was considered insoluble and the parties decided to go to arbitration.
3. The chemical was insoluble in water and had to be dissolved in a different solvent.
4. The mathematical equation was insoluble and the scientist had to think of a different method.
5. The issue was insoluble and the company had to accept the loss.