Not soluble; in capable or difficult of being dissolved, as by a liquid; as, chalk is insoluble in water.
Use to describe a substance that does not dissolve in a solvent to give a reasonable concentration.
insolubility. Compare with soluble. Refers to a substance that does not dissolve in a solvent to any significant degree. Compounds with solubilities of less than 1 g per liter of water are often referred to as 'insoluble', even though they do dissolve to a small extent.