Antonyms of adj semiprecious

1 sense of semiprecious

Sense 1
semiprecious -- (used of gemstones having less commercial value than precious stones; "such semiprecious stones as amethyst, garnet, jade, and tourmaline")

INDIRECT (VIA valuable) -> worthless -- (lacking in usefulness or value; "a worthless idler")

Similarity of adj semiprecious

1 sense of semiprecious

Sense 1
semiprecious -- (used of gemstones having less commercial value than precious stones; "such semiprecious stones as amethyst, garnet, jade, and tourmaline")
       => valuable (vs. worthless) -- (having great material or monetary value especially for use or exchange; "a valuable diamond")