Meaning & use
insoluble
Not able to be dissolved, especially in water or another liquid.
See it in a sentence
Sand is insoluble in water, so it simply settles at the bottom of the glass.
Oil is insoluble in water, which is why the two liquids separate.
A note on using this word
Insoluble is chiefly a chemistry term, but it also describes a problem or difficulty that seems impossible to solve, as in 'an insoluble dilemma.'
Words with a similar meaning
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Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
Another way to use it
2. adjective
Impossible to solve or resolve, used of a problem or difficulty.
The two sides seemed to face an insoluble disagreement over the border.
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