infrenus

infrenus, unbridled

Frieze-Dennison Vergil

īnfrēnus, a, um; also, īnfrēnis, e: unbridled; riding without bridle, 4.41.

Could not find infrenos in Logeion dictionaries.

infrenos Adjective: masculine accusative plural of infrenus

infrēnus, a, um, v. infrenis.