riffly

As an adjective riffly

is shallow and fast-flowing.

As an adverb rifely is

in a rife or widespread manner.

As adjectives the difference between ruffly and riffly

is that ruffly is having many ruffles while riffly is shallow and fast-flowing.

As a noun riffle

is a fast-flowing, shallow part of a stream causing broken water.

As a verb riffle

is to flow over a fast moving shallow part of a stream.

As an adjective riffly is

shallow and fast-flowing.

As adjectives the difference between riffly and riffy

is that riffly is shallow and fast-flowing while riffy is (music) characterized by a lot of riffs (guitar riffs).