insoluble

/IH0 N S AA1 L Y AH0 B AH0 L/
noun
  1. 1

    Any substance that cannot be dissolved.

adjective
  1. 1

    That cannot be dissolved.

  2. 2

    That cannot be solved; unsolvable; insolvable.

  3. 3

    That cannot be explained; mysterious or inexplicable.

  4. 4

    That cannot be broken down or dispersed.

Synonyms

Antonyms

Source: https://en.wiktionary.org/wiki/insoluble