An adjective, although it ends in -LY (like lonely, homely, and smelly). Elderly means old and has no adverb form.
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Nervous is an adjective. The adverb form is nervously.
Silently is an adverb. The adjective is silent.
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.