If you describe something as invaluable, you mean that it is extremely useful. adj oft ADJ in n/-ing, ADJ to n
I was able to gain invaluable experience over that year..., The research should prove invaluable in the study of linguistics...
Translation English Cobuild Collins Dictionary
beyond price, costly, inestimable, precious, priceless, valuable, worth one's or its weight in gold
cheap, rubbishy, valueless, worthless
English Collins Dictionary - English synonyms & Thesaurus
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