inestimable

• inæstimable (archaic)

From Middle French inestimable, from Latin inaestimābilis, from in (“un-”, “not”) + aestimābilis (“estimable”). Equivalent to in- +‎ estimable.

• IPA^(key): /ɪˈnɛːs.tɪ.mə.bəl/
• (Received Pronunciation) enPR: ĭnĕsʹtĭməbl, IPA^(key): /ɪnˈɛstɪməbl/

inestimable (not comparable)

1. Not able to be estimated; not able to be calculated, computed or comprehended, as because of great scale, degree or magnitude.
   • 1776, United States Declaration of Independence

     He has refused to pass other Laws for the accommodation of large districts of people, unless those people would relinquish the right of Representation in the Legislature, a right inestimable to them and formidable to tyrants only.

   The Voyager spacecraft explored the solar system and continued into the inestimable space beyond.

2. Venerable, great.
   • 1789, The Papers of Thomas Jefferson, Volume 15

     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.

• “inestimable, a. (n.)” listed in the Oxford English Dictionary [2^nd Ed.; 1989]

From in- +‎ estimer +‎ -able.

inestimable (plural inestimables)

1. priceless, invaluable; inestimable

• “inestimable”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

inestimable (plural inestimables)

1. priceless, invaluable

• “inestimable”, in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014