Unbridled a. : Loosed from the bridle, or as from the bridle; hence, unrestrained; licentious; violent; as, unbridled passions.

Example:
Is Unbridled capitalism really good for a country?

Taxonomy
Kentucky Derby, colt, free encyclopedia, sire, filly, stakes winners, dam, Facil, Fabuleux, trainer, Belmont Stakes, Kentucky Derby winner, United States, Champion, Summer Squall, the Kentucky Derby, upset, winners.

Defination from the web:
Unbridled (March 5, 1987 - October 18, 2001) was a Champion American thoroughbred racehorse. ... Racing as a four year old, Unbridled won the Deputy Minister Handicap at Gulfstream Park and placed second behind Summer Squall in the Fayette ...