a. [ Pref. un- not + bridled. ] Loosed from the bridle, or as from the bridle; hence, unrestrained; licentious; violent; as, unbridled passions. “Unbridled boldness.” B. Jonson. [ 1913 Webster ]
Lands deluged by unbridled floods. Wordsworth. [ 1913 Webster ]
-- Un*bri"dled*ness, n. Abp. Leighton. [1913 Webster]