Insoluble definition

ĭn-sŏlyə-bəl

That cannot be dissolved.

Insoluble matter.

adjective

That cannot be solved; insolvable.

adjective

That cannot be dissolved; not soluble.

adjective

The definition of insoluble is something that cannot be solved or dissolved.

An example of something insoluble is a cryptic phrase in an old mystery book that people have been trying to uncode for centuries.

adjective

That cannot be dissolved.

adjective

adjective

Difficult or impossible to solve or explain; insolvable.

Insoluble riddles.

adjective

That cannot be solved; unsolvable.

adjective

Not capable of being fully dissolved. Fats and oils are insoluble in water.

Origin of insoluble

Middle English insolible from Latin īnsolūbilis in- not in–¹ solvere to loosen soluble

From American Heritage Dictionary of the English Language, 5th Edition
From Old French, from Latin insolubilis (in- + solubilis).

From Wiktionary