Is Cleverness a Adverb?

Clever is an adjective, and cleverly is an adverb. ... Not all words that end in –ly are adverbs: lovely, costly, friendly, etc.

Is cleverness a noun or adverb?

The property of being clever.

Is cleverness an adjective?

adjective, clev·er·er, clev·er·est. mentally bright; having sharp or quick intelligence; able. superficially skillful, witty, or original in character or construction; facile: It was an amusing, clever play, but of no lasting value.