incapable of being estimated or assessed.

too large or great to be estimated or appreciated

The flood caused inestimable damage.

of incalculable value; valuable beyond measure; priceless

jewels of inestimable worth.

adjective

invaluable , precious , valuable , costly , priceless , worthy , countless , immeasurable , incomputable , infinite , innumerable , measureless , uncountable , exquisite , unmeasurable