insoluble

Let a bottle of salad dressing stand on the table for a few hours and you will notice that it has separated into layers. That's because oil is insoluble or is not capable of being dissolved.

Insoluble comes from the Latin insolubilis meaning "that cannot be loosened." When a substance is insoluble, it cannot be dissolved or loosened in water. Similarly, a situation that is insoluble has no hope of being solved. When a marriage is beyond repair and cannot be fixed, it is insoluble.

Definitions of insoluble
1

adj (of a substance) incapable of being dissolved

Synonyms:
indissoluble
non-water-soluble, water-insoluble
not soluble in water
Antonyms:
soluble
(of a substance) capable of being dissolved in some solvent (usually water)
alcohol-soluble
soluble in alcohol
dissoluble, dissolvable
capable of dissolving
fat-soluble
soluble in fats
disintegrable, meltable
capable of melting
oil-soluble
soluble in oil
water-soluble
soluble in water
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adj admitting of no solution or explanation

“an insoluble doubt”
Synonyms:
incomprehensible, inexplicable
incapable of being explained or accounted for
insolvable, unresolvable, unsoluble, unsolvable
not easily solved
Antonyms:
soluble
susceptible of solution or of being solved or explained
explicable
capable of being explicated or accounted for
answerable
capable of being answered
resolvable, solvable
capable of being solved
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adj without hope of solution

“an insoluble problem”
Synonyms:
hopeless
without hope because there seems to be no possibility of comfort or success

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