vice

Pride is a vice, not a virtue.

1839, From the case of Scholefield v. Robb Gilligan, Brenda (2002) Practical Horse Law, →ISBN: “So a horse with say, navicular disease, making him suitable only for light hacking, would probably be unsound, whereas rearing would be a vice, being a "defect in the temper... making it dangerous". A vice can however render a horse unsound - possibly a crib biter will damage its wind.”