vice

1. vice (noun) — sense 1

Definition: Bad or immoral behaviour. (Especially often, a habit that harms oneself or others)

Example: Pride is a vice, not a virtue.

2. vice (noun) — sense 2

Definition: Any of various crimes related (depending on jurisdiction) to weapons, prostitution, pornography, gambling, alcohol, tobacco, or drugs.

3. vice (noun) — sense 3

Definition: A defect in the temper or behaviour of a horse, such as to make the animal dangerous, to injure its health, or to diminish its usefulness.

Example: 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.