Having, or capable of exerting, power or influence.
The powerful grace that lies / In herbs, plants, stones, and their true qualities.
Leading to many or important deductions.
a powerful set of postulates
Large; capacious; said of veins of ore.
very; extremely
"She was stinkin' hot down here that summer, an' we were powerful dry."
From Middle English pouerful, powarfull. By surface analysis, power + -ful.
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