1. Very heavy; weighty; as, a ponderous shield; a ponderous load; the ponderous elephant. The sepulcher . . . Hath oped his ponderous and marble jaws. (Shak)
2. Important; momentous; forcible. Your more ponderous and settled project.
3. Heavy; dull; wanting; lightless or spirit; as, a ponderous style; a ponderous joke.
(Science: chemical) Ponderous spar, heavy spar, or barytes. See barite.
Origin: L. Ponderosus, from pondus, -eris, a weight: cf. F. Pondereux. See Ponder.