valuable

adjective

1 a valuable watch:

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, treasured.

▷antonyms cheap, worthless.

2 a valuable contribution:

useful, helpful, of use, of help, of assistance, practical, beneficial, invaluable, productive, constructive, effective, handy, advantageous, worthwhile, profitable, rewarding, gainful, fruitful, worthy, important.

▷antonyms useless.

valuable Oxford Dictionary of English