unbridled

adjective

1. not controlled or restrained: unbridled enthusiasm.
2. not fitted with a bridle.

verb (used with object), un·bri·dled, un·bri·dling.

1. to remove the bridle from (a horse, mule, etc.).
2. to free from restraint.

adjective

1. with all restraints removed
2. (of a horse, etc) wearing no bridle

verb (tr)

1. to remove the bridle from (a horse)
2. to remove all controls or restraints from

adj.late 14c., originally in figurative sense of “unrestrained, ungoverned,” from un- (1) “not” + bridled (see bridle (v.)). Cf. Middle Dutch ongebreidelt. Literal sense of “not fitted with a bridle” (of horses) is not recorded before 1550s. The verb unbridle is attested from c.1400 in the literal sense; mid-15c. in the figurative sense.