Pow"er*ful (?), a. 1. Full of power; capable of producing great effects of any kind; potent; mighty; efficacious; intense; as, a powerful man or beast; a powerful engine; a powerful argument; a powerful light; a powerful vessel.

The powerful grace that lies
In herbs, plants, stones, and their true qualities.

2. (Mining) Large; capacious; -- said of veins of ore.

Syn. -- Mighty; strong; potent; forcible; efficacious; energetic; intense.

-- Pow"er*ful*ly, adv. -- Pow"er*ful*ness, n.