An irregular adverb is a word that describes how an action is performed, but which does not take on the regular form of most adverbs. Adjectives and adverbs both describe other types of words; while adjectives typically describe a noun, an adverb is primarily used to describe a verb. Most adverbs are formed through the modification of an adjective using the suffix “-ly,” such as the adjective “quick” that is used to form the adverb “quickly.” An irregular adverb, however, still serves the same function of any other adverb, but does not take this usual form and can include words like “well".