drossless

Adjective

 * 1) Free from dross.
 * 2) * 1791, William Bagshaw Stevens, "to the author of the poem on the loves of the plants" (prefixed to 's The Botanic Garden)
 * OFT tho' thy genius, DARWIN! amply fraught With native wealth, explore new worlds of mind; Whence the bright ores of drossless wisdom brought, Stampt by the Muse's hand, enrich mankind;