mysteriously vs mysterious

mysteriously is not an adjective while mysterious is an adjective.

Word	Noun	Adjective	Verb	Adverb
mysteriously	No	No	No	Yes
mysterious	No	Yes	No	No

mysteriously (adjective)	mysterious (adjective)
	having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
	of an obscure nature

mysteriously (adverb)	mysterious (adverb)
in a cryptic manner