[in-es-tuh-muh-buh l]
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  1. incapable of being estimated or assessed.
  2. too large or great to be estimated or appreciated: The flood caused inestimable damage.
  3. of incalculable value; valuable beyond measure; priceless: jewels of inestimable worth.

Origin of inestimable

First recorded in 1350–1400; Middle English word from Latin word inaestimābilis. See in-3, estimable
Related formsin·es·ti·ma·bil·i·ty, in·es·ti·ma·ble·ness, nounin·es·ti·ma·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for inestimable

invaluable, precious, valuable

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Historical Examples of inestimable

British Dictionary definitions for inestimable


  1. not able to be estimated; immeasurable
  2. of immeasurable value
Derived Formsinestimability or inestimableness, nouninestimably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for inestimable

late 14c., "beyond estimation," from Old French inestimable (14c.) or directly from Latin inaestimabilis, from in- "not, opposite of" (see in- (1)) + aestimabilis (see estimable). Meaning "too precious to set a value on, priceless" is attested by 1570s. Related: Inestimably.

Online Etymology Dictionary, © 2010 Douglas Harper