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1. Impossible to estimate or compute: inestimable damage. See Synonyms at incalculable.
2. Of immeasurable value or worth; invaluable: "shared all the inestimable advantages of being wealthy, good-looking, confident and intelligent" (Doris Kearns Goodwin).

in·es′ti·ma·bly adv.
References in classic literature ?
This entails the practical disadvantage of making the Bible--events, characters, and ideas--seem less real and living; but on the other hand it helps inestimably to create the finer imaginative atmosphere which is so essential for the genuine religious spirit.
I bore my share of that inestimably precious burden with a manly tenderness, with a fatherly care.
The windows, heavily shaded by trees, admitted a subdued light that made the faces around me pale, and darkened the old brasses in the pavement and the time and damp-worn monuments, and rendered the sunshine in the little porch, where a monotonous ringer was working at the bell, inestimably bright.
There are two people in the world to whom you are inestimably precious, and who are determined not to let your happiness be sacrificed.
A spokesman for the Welsh Conservatives said: "If these allegations are true, then the Welsh Labour Government's cancellation of the Vietnam expedition will have cost the taxpayer inestimably more than the PS5,000 their spin team originally claimed.
According to the KCBS' publication on July 5, 2016, value of properties in the Santa Clara County where the Silicon Valley lies, has inestimably appreciated as a result of building boom.
The smell, of perhaps ammonia, of bleach, of urine, of human in some inestimably horrible combination, will be with me forever, a permanent mark on my soul, a reminder.
Many were the times when she would persuasively recommend us for coveted writing, editing and directing assignments-that in turn led to other opportunities and contacts that inestimably bolstered our career for the long term.
The inestimably great, keenly missed Jim Houghton--founder of New York's Signature Theatre--modeled this "looking backward" for us at his theatre by engaging with a playwright over first a season's length, then over a career's length.
For these British divines, Sarpi's History was an inestimably valuable testimony of the true events at the Council of Trent, both "on the stage" and behind the scenes.
But two days ago,my annoyance was inestimably amplified by a young lady on a Hindi news channel who referred to me,your dear pet,as ' Labradog'.
His superior professional skill, keen judgment in evaluating the condition of patients and tireless devotion to duty contributed inestimably to the success of each operation and were in keeping with the finest traditions of the Medical Department.