He cried hysterically as the flames enveloped his house: Hysterically used as?

He cried hysterically as the flames enveloped his house: Hysterically used as?

Explanation

Adverb isĀ 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.