Is Slowly an adverb?

Is Slowly an adverb? Usually slow is used as an adjective and slowly is used as an adverb, but slow can also be used as an adverb. When an adverb does not have the usual -ly ending it is called a flat adverb or plain adverb and it looks the same as its adjective form.

Usually slow is used as an adjective and slowly is used as an adverb, but slow can also be used as an adverb. When an adverb does not have the usual -ly ending it is called a flat adverb or plain adverb and it looks the same as its adjective form.