Etymology
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inestimable (adj.)

late 14c., "beyond estimation or measure, not to be computed," from Old French inestimable "priceless" (14c.) or directly from Latin inaestimabilis "invaluable, incalculable," also "not estimable, valueless," from in- "not, opposite of" (see in- (1)) + aestimabilis "valuable, estimable," from aestimare (see esteem (v.)). Meaning "too precious to set a value on, priceless" is attested by 1570s. Related: Inestimably; inestimability.

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Definitions of inestimable

inestimable (adj.)
beyond calculation or measure;
jewels of inestimable value
Synonyms: incomputable / immeasurable
From wordnet.princeton.edu