Definition of inestimable adjective from the Oxford Advanced Learner's Dictionary

 

inestimable

 adjective
adjective
BrE BrE//ɪnˈestɪməbl//
 
; NAmE NAmE//ɪnˈestɪməbl//
 
(formal)
 
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too great to calculate The information he provided was of inestimable value. Word Origin late Middle English: via Old French from Latin inaestimabilis, from in- ‘not’ + aestimabilis (from aestimare ‘to estimate’).
See the Oxford Advanced American Dictionary entry: inestimable