voluntarily
adverb
[ ˈvɒl(ə)ntrɪli ]
• of one's own free will.
• "he voluntarily attended a police station"
Similar:
of one's own free will,
of one's own accord,
of one's own volition,
of one's own choice,
of one's own choosing,
by choice,
by preference,
willingly,
readily,
freely,
intentionally,
deliberately,
on purpose,
purposely,
spontaneously,
without being asked,
without being forced,
without hesitation,
without reluctance,
gladly,
with pleasure,
with good grace,
eagerly,
enthusiastically,
Opposite:
under duress,