Silently is an adverb. The adjective is silent.
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In the given sentence, many (adjective), passengers (noun), stood (verb), as(conjunction), the (article), elevator (noun) and moved (verb) are not adverbs.It would seem easier to name the 3 adverbs:The adverb silently modifies the verb stood.The adverb downward modifies the verb moved.The adverb quickly modifies the verb moved. (it is a pair, rather than modifying the other adverb).
Nervous is an adjective. The adverb form is nervously.
Comprehensible is an adjective. The adverb is comprehensibly.
Lively can be used as an adjective and an adverb. Adjective: a lively discussion Adverb: step lively
Serenely is an adverb. The adjective form is serene.