insoluble
adjective
[ ɪnˈsɒljʊb(ə)l ]
• impossible to solve.
• "the problem is not insoluble"
Similar:
unsolvable,
insolvable,
unable to be solved,
without a solution,
unanswerable,
unresolvable,
unfathomable,
impenetrable,
unexplainable,
inscrutable,
baffling,
puzzling,
perplexing,
enigmatic,
obscure,
mystifying,
mysterious,
inexplicable,
• (of a substance) incapable of being dissolved.
• "once dry, the paints become insoluble in water"
Similar:
not soluble,
indissoluble,
incapable of dissolving,
Origin:
late Middle English: from Old French, or from Latin insolubilis, from in- ‘not’ + solubilis (see soluble).
