1. Precious above estimation; inestimable; priceless.

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

• invauleable,
• incaluably,
• infaliable,
• envaluble,
• invaluabe,
• envaluable,
• invauable,
• invaluebale,
• invalueble,
• invalube,
• invalluable,
• invaluble,
• invaliable,
• invaluabel,
• invaluabble,
• invaluablle,
• inveluable,
• illaquable,
• Inaquable,
• Ingalable

• inflatable,
• involucre,
• invalidate,
• involute,
• inapplicable,
• inviolable,
• invalidated,
• influent,
• infallible,
• influence,
• influenza.

The adjective form of the word "invaluable" is "invaluable".

The plural form of the word "invaluable" is "invaluables".

The singular form of "invaluable" is "invaluable". "Invaluable" is an adjective that does not change in form between singular and plural.