spontaneous
voluntary
volitionate
whistle down the wind
willingly
freely
choiceless
voluntarily
adopted
adoptive
motu proprio
willy-nilly
under one's own steam
ex proprio motu
agency
optional
Hobson's choice
unaccountable
sua sponte
option
unpromptedly
march to the beat of a different drum
elective
nonvolitional
on one's lee-lane
you pays your money and you takes your choice
on one's tod
espouse
self-evacuate
clear
self-select
on one's own account
arrogate
take over
seize
usurp
simply
assume
bird of one's own brain
self-directed
solipsistically
self-elect
at the disposal of
free rein
nem con
FOC
liberty
nemine contradicente
unanimously
self-determine
optionless
release
escape
willing
lone
volition
initiatively
pitch upon
choosing
dispose of
desireless
volitional
help oneself
no two ways about it
self-determination
bagless
on one's ones
free as in beer
on one's own hook
promiscuous
stand on one's own two feet
on one's bill
vagile
forspare
away
on one's Jack Jones
permissiveness
monopoly
detention
secure
platonic
on the hoof
think of
tolerance
unafraid
unmoor
impulse buy
untroubled
have one's pick
choiceful
consumedly
self-seeking
electively
independently
own
mero motu
executive decision