adv. 25B6; adverb VOLUNTARILY, of one's own free will, of one's own accord; readily, without reluctance, ungrudgingly, cheerfully, happily, gladly, with pleasure.
WILLINGLY
Meaning of WILLINGLY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012