Is quickly an adjective or adverb?
Quickly is an adverb. It can modify verbs, adjectives, or other adverbs (e.g., “The girls ran quickly“). The adjective form is quick and can modify nouns (e.g., “That test was really quick!”)
In casual speech, you will sometimes hear quick used as an adverb (e.g., “Let’s go quick!”), but quickly is never used as an adjective.
Use QuillBot’s Grammar Checker to make sure you keep quick and quickly straight.