solemnly

As an adverb solemnly

is in a solemn manner.

As a noun earnest is

gravity; serious purpose; earnestness.

As a verb earnest is

to be serious with; use in earnest.

As an adjective earnest is

serious in speech or action; eager; urgent; importunate; pressing; instant.

As a proper noun Earnest is

a given name derived from Germanic, an occasional spelling variant of Ernest.

As adverbs the difference between sincerely and solemnly

is that sincerely is in a sincere or earnest manner; honestly while solemnly is in a solemn manner.

As adverbs the difference between solemnly and solely

is that solemnly is in a solemn manner while solely is alone; exclusively.

As adverbs the difference between solemnly and sadly

is that solemnly is in a solemn manner while sadly is in a sad manner; sorrowfully.

As adverbs the difference between solemnly and gravely

is that solemnly is in a solemn manner while gravely is in a grave or serious manner.

As an adjective gravely is

characterised by gravel, pebbles, or small stones.

As adverbs the difference between grimly and solemnly

is that grimly is in a grim manner while solemnly is in a solemn manner.

As an adjective grimly

is (rare) grim-looking, grim-natured.

As an adverb solemnly

is in a solemn manner.

As an adjective dignified is

respectable.

As a verb dignified is

(dignify).

As an adverb solemnly

is in a solemn manner.

As a noun soley is

buttercup.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adverb solemnly is

in a solemn manner.