Answer:
Not
Step-by-step explanation:
Adverb is a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc.
One of the most common adverbs, not, doesn't end in ly: Not is an adverb because it reverses the meaning of the verb from positive to negative.