Unexplained Mysteries

adjective describes or modifies a noun or pronoun, in this case, 'mysteriously' describes how something is done in a mysterious manner

adverb modifies a verb, adjective, or other adverb by providing information on how an action is performed or how something is described

• The ancient artifact mysteriously disappeared from the museum overnight.
• She mysteriously stopped answering my calls out of the blue.
• That party was so wild, people were mysteriously vanishing left and right.
• Her emotions were like a dark storm cloud, swirling mysteriously inside her.