precious vs preciously

precious is an adjective but preciously is not an adjective.

Word	Noun	Adjective	Verb	Adverb
precious	No	Yes	No	Yes
preciously	No	No	No	Yes

As adverbs, precious and preciously are synonyms defined as:

precious (adjective)	preciously (adjective)
obviously contrived to charm
characterized by feeling or showing fond affection for
of high worth or cost
held in great esteem for admirable qualities especially of an intrinsic nature

precious (adverb)	preciously (adverb)
very	very