Lively can be used as an adjective and an adverb.
Adjective: a lively discussion
Adverb: step lively
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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.
Serenely is an adverb. The adjective form is serene.
adverb