SWIFT'NESS, noun Speed; rapid motion; quickness; celerity; velocity; rapidity. swiftness is a word of general import, applicable to every kind of motion, and to every thing that moves; as the swiftness of a bird; the swiftness of a stream; swiftness of descent in a falling body; swiftness of thought, etc.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI