ponderous

PON'DEROUS, a. [L. ponderosus.]

1. Very heavy; weighty; as a ponderous shield; a ponderous load.

2. Important; momentous; as a ponderous project. [This application of the word is unusual.]

3. Forcible; strongly impulsive; as a motion vehement or ponderous; a ponderous blow.

Ponderous spar, heavy spar, or baryte.