with all restraints removed (of a horse, etc) wearing no bridle
WordReference Random House Learner's Dictionary of American English © 2025
un•bri•dled /ʌnˈbraɪdld/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2025- not restrained;
not held back;
uninhibited:unbridled enthusiasm. - not fitted with a bridle:an unbridled horse.
un•bri•dled
(un brīd′ld),USA pronunciation adj.
- not controlled or restrained:unbridled enthusiasm.
- not fitted with a bridle.
- Middle English unbrydled. See un-1, bridled 1325–75
Collins Concise English Dictionary © HarperCollins Publishers::
'unbridled' also found in these entries (note: many are not synonyms or translations):