Definition of "insoluble" in English

adjective

1. (physical chemistry) That cannot be dissolved.

   • Petroleum is largely insoluble in water.

2. That cannot be solved.

   • The reason Fisher concluded that the problem is likely insoluble is that the ability of real-world agents to act on new perceived opportunities of arbitrage – including those that turn out to be incorrect – makes stability impossible to demonstrate without additional strong (and unrealistic) assumptions.

3. That cannot be explained.

   • Near-synonyms: unexplained, mysterious; see also Thesaurus:incomprehensible, Thesaurus:mysterious

4. That cannot be broken down or dispersed.

noun

1. Any substance that cannot be dissolved.