- unbridled
- unchecked
- unrestrained
- wild
Synonyms for effrenus
- efferus – fierce, savage, undomesticated, untamed, wild
- expeditus – light, unchecked, unimpeded
- ferox – arrogant, courageous, headstrong, spirited, unbridled, warlike, wild
- ferus – fierce, savage, untamed, wild
- impunitus – safe, unpunished, unrestrained
- indomitus – untamed, wild
- infrenis – unbridled
- infrenus – unbridled
- laxe – loosely, unrestrained, widely
- licens – free, unchecked, unimpeded, unrestrained
- torva – savage, wild