Not able to be estimated; not able to be calculated, computed or comprehended, as because of great scale, degree or magnitude.
The Voyager spacecraft explored the solar system and continued into the inestimable space beyond.
Venerable, great.
On my arrival hither I found a letter from the inestimable Mr. Wythe, by which he informs me that in consequence of a late act of our general assembly he remains the sole judge of the high court of chancery.
From Middle French inestimable, from Latin inaestimābilis, from in (“un-”, “not”) + aestimābilis (“estimable”). Equivalent to in- + estimable.
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