WILLINGLY (adverb) definition and synonyms | Macmillan Dictionary.
What word class is the word willingly?
adverb. in a consenting and often cheerful way:They volunteer for duty on faraway battlefields, willingly putting their lives on the line to fight and possibly die for their country.
What is the adverb form of willingness?
wilfully. (obsolete) Willingly, of one's own free will. Deliberately, on purpose; maliciously.