willingly
adverb
[ ˈwɪlɪŋli ]
• readily; of one's own free will.
• "she went willingly"
Similar:
voluntarily,
of one's own free will,
of one's own accord,
of one's own volition,
by choice,
readily,
without hesitation,
without reluctance,
ungrudgingly,
cheerfully,
happily,
gladly,
with pleasure,
with good grace,
eagerly,
enthusiastically,
freely,
spontaneously,
unforced,
at the drop of a hat,
like a shot,