It would be an adverb. If you said "I willingly gave up my last cookie," the word "willingly" would be an adverb because it describes a verb. Adverbs typically modify verbs, adjectives, or other adverbs.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
Yes, according to Christian belief, Jesus willingly chose to go to the cross as part of his divine plan for salvation.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.