Inestimable (adjective)

1. Not capable of being estimated or valued.
2. Not capable of being measured or quantified.

Origin:

This word is formed by the combination of the prefix "in-" meaning "not" and the word "estimable" meaning "worthy of respect or admiration" or "capable of being estimated".

Examples:

1. The value of his contributions to the field was inestimable.
2. The cost of the project was inestimable, as it was not possible to predict all the costs involved.
3. The inestimable worth of the painting was only realized after it was sold at auction.
4. The impact of the teacher on his students was inestimable.
5. The importance of the discovery was inestimable and changed the course of history.