"Rapidness" is a word in ENGLISH

To throw in or on in a rapid, careless manner; to mix, reduce, or adulterate, by throwing in something of …

Having the quality of rapidly becoming dry.

The quality or power of producing fruit; fruitfulness; especially (Biol.), the quality in female organisms of reproducing rapidly and in …

The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; rapidity of speech; rapidity …

Having the quality opposite to adhesiveness; allowing or causing anything to slip or move smoothly, rapidly, and easily upon the …

The quality or state of being swift; speed; quickness; celerity; velocity; rapidity; as, the swiftness of a bird; the swiftness …