vis (vini); virtus, utis, f; ferocia [ae, f] (vini); fortitudo, inis, f; nervus [i, m] (omnibus nervis contendendum est; nervi oratorii); vigor [oris, m] (animi; aetatis); firmitas [atis, f]; stabilitas [atis, f]; duritia [ae, f]; durities [e]i, f; robur, oris, n; soliditas [atis, f];