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From The Collaborative International Dictionary of English v.0.48:
Unbridled \Un*bri"dled\, 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]