grinningly

As adverbs the difference between grindingly and grinningly

is that grindingly is in a grinding fashion; in a way that grinds while grinningly is with a grin.

As a noun terms

is .

As an adverb grinningly is

with a grin.

As a noun grin

is a smile in which the lips are parted to reveal the teeth.

As a verb grin

is to smile, parting the lips so as to show the teeth.

As an adverb grinningly is

with a grin.