acting at will without restraint; unbridled or reckless

to behave unscrupulously

referring to a free, expansive, and unrestrained style in literature, calligraphy, or art

to indulge in something to one's heart's content or give free rein to one's feelings

haughty and excessively pleased with oneself

cruel, ruthless, and tyrannical

to behave recklessly

arrogant and unbridled

to abandon restraint and have a fling (idiom)

to follow lustful desires