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.
Comprehensible is an adjective. The adverb is comprehensibly.
Silently is an adverb. The adjective is silent.
Serenely is an adverb. The adjective form is serene.
adverb