\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.
      Lands deluged by unbridled floods.       --Wordsworth.
-- {Un*bri"dled*ness}, n. --Abp. Leighton.