zì yì
without restraint
unbridled
reckless
zì
to abandon restraint
to do as one pleases
comfortable (dialect)
zì sì
unrestrained
unbridled
free and unrestrained (style)
bold
zì qíng
to indulge in something to one's heart's content
wanton or willful
zì yù
to follow lustful desires
zì yì xíng lè
to abandon restraint and have a fling (idiom)