Loosed from the bridle, or as from the bridle; hence, unrestrained; licentious; violent; as, unbridled passions
If you describe behaviour or feelings as unbridled, you mean that they are not controlled or limited in any way. a tale of lust and unbridled passion. not controlled and too extreme or violent
not restrained or controlled; "unbridled rage"; "an unchecked temper"; "ungoverned rage"