insoluble
/ɪnˈsɑljəbəl/
adjective
- Unable to be dissolved in a liquid, especially water.
- The chemist tested whether the powder was soluble or insoluble in alcohol.
- Sand is insoluble in water, so it sinks to the bottom.
- Some vitamins are fat-soluble, while others are insoluble in oil.
- Impossible to solve or explain; having no solution.
- The ancient riddle seemed insoluble until a child solved it.
- Some math problems are insoluble with current methods.
- For years, the mystery of the missing painting remained insoluble.
Synonyms