Free from restraint or control; unrestrained, unleashed. Also in literal sense: (of a horse, etc.) free from the control of the reins.

Of passions: Unbridled, ungovernable.

Not furnished with a bit; unbridled, unrestrained. Also figurative.

Of a feeling, passion, disease, etc.: raging, rampant; unbridled, uncontrollable; (also, of an attitude, view, etc.) extreme, fanatical.

Given to or characterized by romping or ramping (in various senses).