1. A horse, animal, or vehicle that cannot be relied upon for consistent performance or safety
The old truck was an undependable mount that often broke down during important trips.
O caminhão velho era uma montaria não confiável que frequentemente quebrava durante viagens importantes.
2. In fantasy or gaming contexts, a creature or beast unsuitable for riding due to unreliable temperament or physical condition
The knight refused to ride the undependable mount into battle.
O cavaleiro recusou-se a montar a criatura não confiável na batalha.