adjective
- unable to be dissolved in a liquid
- impossible to solve or explain
Usage: chemistry; science
Examples
- Oil is insoluble in water.
- The powder remained insoluble despite vigorous stirring.
- Salt is soluble in water, but sand is insoluble.
- The mystery seemed insoluble to the detective.
- They faced an insoluble problem with no clear answer.
- The conflict appeared insoluble after years of negotiations.
- Some mathematical problems remain insoluble with current methods.