UNBRIDLED
unbridled, unchecked, uncurbed, ungoverned
(adjective) not restrained or controlled; āunbridled rageā; āan unchecked temperā; āungoverned rageā
Source: WordNet® 3.1
Etymology
Adjective
unbridled (comparative more unbridled, superlative most unbridled)
Not fitted with a bridle.
(by extension) Without restraint or limit.
Verb
unbridled
simple past tense of unbridle
Source: Wiktionary
Un*bri"dled, a. Etym: [Pref. un- not + bridled.]
Definition: 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.
UNBRIDLE
Un*bri"dle, v. t. Etym: [1st pref. un- + bridle.]
Definition: To free from the bridle; to set loose.
Source: Webster’s Unabridged Dictionary 1913 Edition