1. That cannot be dissolved; that cannot be explained.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• insoluable,
• invaluble,
• inaluble,
• unsoluble,
• jnsoluble,
• knsoluble,
• onsoluble,
• 9nsoluble,
• insoluible,
• insolubel,
• insolubble,
• insolable,
• involucre,
• involutee,
• insocible,
• insocable,
• insouvlet,
• Innocuible,
• Resolubile,
• insoloble

• inoculator,
• inoculation,
• inoculating,
• insolation,
• inoculum,
• insolent,
• inclusive,
• insolvable,
• insolubility,
• insolvent,
• include,
• inoculant,
• insolence,
• innoculate,
• inoculate,
• insolate,
• included,
• insolently,
• insolvency,
• insole.

The adjective form of the word "insoluble" is "insolvable".

The plural form of the word "insoluble" is "insolubles".

The singular form of the word "insoluble" is "insoluble".