Longman Dictionary of Contemporary English homepage

insoluble

 adjective
     
Related topics: Daily Life, Chemistry
in‧sol‧u‧ble
1 an insoluble problem is or seems impossible to solve:
insoluble conflicts within the department
2HCD an insoluble substance does not become a liquid when you put it into a liquid [≠ soluble; ↪ dissolve]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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