The word "invaluable" is what you're looking for I think. Definition: beyond calculable or appraisable value.

Answer from user16408 on Stack Exchange
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Merriam-Webster
merriam-webster.com › thesaurus › valuable
VALUABLE Synonyms: 64 Similar and Opposite Words | Merriam-Webster Thesaurus
Synonyms for VALUABLE: expensive, costly, precious, premium, extravagant, high, priceless, pricey; Antonyms of VALUABLE: inexpensive, reasonable, cheap, worthless, moderate, valueless, discounted, lemon
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Thesaurus.com
thesaurus.com › browse › valuable
VALUABLE Synonyms & Antonyms - 90 words | Thesaurus.com
Find 90 different ways to say VALUABLE, along with antonyms, related words, and example sentences at Thesaurus.com.
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Cambridge Dictionary
dictionary.cambridge.org › thesaurus › very-valuable
VERY VALUABLE - 11 Synonyms and Antonyms - Cambridge English
These are words and phrases related to very valuable. Click on any word or phrase to go to its thesaurus page. ... Synonyms for very valuable from Random House Roget's College Thesaurus, Revised and Updated Edition © 2000 Random House, Inc.
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Thesaurus.com
thesaurus.com › browse › most-valuable
MOST VALUABLE Synonyms & Antonyms - 43 words | Thesaurus.com
very important; priceless · Synonyms · STRONGEST · beneficial costly expensive helpful important invaluable prized profitable relevant scarce treasured useful valued worthwhile · STRONG · collectible dear heirloom worthy · WEAK · admired appreciated cherished esteemed estimable held ...
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WordHippo
wordhippo.com › what-is › another-word-for › valuable.html
What is another word for valuable? | Valuable Synonyms - WordHippo Thesaurus
Synonyms for valuable include invaluable, priceless, precious, inestimable, irreplaceable, prizable, prized, beyond price, treasurable and high-value. Find more similar words at wordhippo.com!
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Collins Dictionary
collinsdictionary.com › dictionary › english-thesaurus › valuable
VALUABLE Synonyms | Collins English Thesaurus
Synonyms for VALUABLE in English: useful, important, profitable, worthwhile, beneficial, valued, helpful, worthy, of use, of help, …
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Power Thesaurus
powerthesaurus.org › very_valuable › synonyms
VERY VALUABLE Synonyms: 115 Similar Phrases
February 8, 2022 - Find 115 synonyms for Very Valuable to improve your writing and expand your vocabulary.
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YourDictionary
thesaurus.yourdictionary.com › home › valuable
Valuable Synonyms: 47 Synonyms and Antonyms for Valuable | YourDictionary.com
Synonyms for VALUABLE: expensive, costly, precious, inestimable, invaluable, priceless, salable, marketable; Antonyms for VALUABLE: worthless, unimportant, useless, cheap, unsaleable, unmarketable, valueless, garbage.
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Cambridge Dictionary
dictionary.cambridge.org › us › thesaurus › valuable
VALUABLE - 57 Synonyms and Antonyms - Cambridge English
We had a very instructive discussion. ... The furniture is functional, not fashionable. ... On the shelves there is a mixture of utilitarian and decorative objects. ... That's a handy little gadget. ... There has to be a more efficient way to handle the problem. ... The working hypothesis is that this is not cross-contamination. ... The machine is nothing more than a useless piece of metal. Go to the thesaurus article about these synonyms ...
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Thesaurus.com
thesaurus.com › browse › highly-valued
HIGHLY VALUED Synonyms & Antonyms - 34 words | Thesaurus.com
Find 34 different ways to say HIGHLY VALUED, along with antonyms, related words, and example sentences at Thesaurus.com.
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Wiktionary
en.wiktionary.org › wiki › Thesaurus:valuable
Thesaurus:valuable - Wiktionary, the free dictionary
very valuable · extremely valuable · of great value · beyond price · without price · unpriced (archaic) worth one's weight in gold · Other near-synonyms · cherished · treasured · appreciated · dear · beloved [⇒ thesaurus] expensive [⇒ thesaurus] worthwhile ·
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Oxford Learner's Dictionaries
oxfordlearnersdictionaries.com › definition › english › valuable
valuable adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com
Synonyms valuablevaluableprecious ▪ priceless ▪ irreplaceableThese words all describe something that is worth a lot of money or very important to somebody.valuable worth a lot of money:
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Vocabulary.com
vocabulary.com › dictionary › valuable
Valuable - Definition, Meaning & Synonyms | Vocabulary.com
“a valuable friend” · synonyms: worthful · worthy · having worth or merit or value; being honorable or admirable · adjective having great material or monetary value especially for use or exchange · “a valuable diamond” · synonyms: expensive · high in price or charging high prices ·
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Free Thesaurus
freethesaurus.com › valuable
Valuable synonyms, valuable antonyms - FreeThesaurus.com
Synonyms for valuable in Free Thesaurus. Antonyms for valuable. 41 synonym for valuable: useful, important, profitable, worthwhile, beneficial, valued, helpful, worthy, of use, of help, invaluable, serviceable.... What are synonyms for valuable?
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WordReference
wordreference.com › dictionaries › valuable
valuable - WordReference.com English Thesaurus
valuable - WordReference thesaurus: synonyms, discussion and more. All Free.
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Reverso Dictionary
synonyms.reverso.net › synonym › en › valuable
valuable | Synonyms and analogies for valuable in English | Reverso Dictionary
His Lordship is missing a very valuable snuff box. Programmable, electronically controlled safe for storage of valuable items. ... Discover interesting words and their synonyms spell, alternative, infant, lie, distinction, turf, build, less, ride, when, often, story, field, plant, living, using, emergency, great, kind, today.
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Collins Dictionary
collinsdictionary.com › dictionary › english › valuable
VALUABLE definition and meaning | Collins English Dictionary
The experience was very valuable. Synonyms: useful, important, profitable, worthwhile More Synonyms of valuable
Published   March 26, 2018
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Power Thesaurus
powerthesaurus.org › immensely_valuable › synonyms
IMMENSELY VALUABLE Synonyms: 113 Similar Words & Phrases
AboutPRO MembershipExamples of SynonymsTermsPrivacy & Cookie Policy · Lists · Parts of speech · very valuable · adj. highly valuable · adj. extremely valuable · adj. most valuable · adj. particularly valuable · adj. highly desirable · ...
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Bab.la
en.bab.la › synonyms › english › valuable
VALUABLE - Synonyms and antonyms - bab.la
In the sense of extremely useful ... precious • costly • high-priced • high-cost • expensive • dear • worth its weight in gold • worth a king's ransom • priceless • beyond price • without price • of incalculable value/worth • of inestimable value/worth • of immeasurable value/worth • invaluable • irreplaceable • inestimable • prized • cherished • valued • treasuredOpposites cheap ...