And that some members of this conspiracy, notably the boy named Bonito de Madrid, commonly called Bonzo, are quite likely to exhibit no self-restraint when this punishment takes place, so that Ender Wiggin, an inestimably important international resource, will be placed in serious danger of having his brains pasted on the walls of your simple orbiting schoolhouse.
There are no more uses of "inestimable" in the book.
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jewels of inestimable value
a right inestimable to them
Thomas Jefferson et al. -- The Declaration of Independence