valuable
adj
1 costly, dear, expensive, high-priced, precious
2 beneficial, cherished, esteemed, estimable, held dear, helpful, important, prized, profitable, serviceable, treasured, useful, valued, worth one's or its weight in gold, worthwhile, worthy
n
3 (usually plural)
heirloom, treasure(s)
Antonyms
, adj
1 cheap, cheapo (informal) chickenshit (U.S. slang) crappy (slang) inexpensive, worthless
2 insignificant, pointless, silly, trifling, trivial, unimportant, useless, worthless