Inestimable

прилагательное не поддающийся оценке; бесценный, неоценимый

Большой англо-русский словарь

Inestimable

adjective Etymology: Middle English, from Middle French, from Latin inaestimabilis, from in- + aestimabilis estimable 1. incapable of being estimated or computed Example: storms caused inestimable damage 2. too valuable or excellent to be measured or appreciated Example: has performed an inestimable service for his countryinestimably adverb

Merriam-Webster's Collegiate Dictionary