Synonyms for valuable

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1. Worth money

   salable, marketable, in demand, high-priced, commanding a good price, precious, costly, expensive, dear, of value, in great demand, hardly obtainable, scarce, priceless, invaluable, worthwhile, inestimable, worth its weight in gold*; see also expensive.

   Antonyms cheap*, worthless, unsaleable, unmarketable.

2. Helpful

   important, estimable, worthy; see helpful 1, relevant. See syn. study at expensive.