Unpleasantness, disagreeableness (to the senses).
Lack of cleanliness.
Indecency; corruption; unkindness, meanness, spite, harshness, cruelty.
Dirt, filth.
A nasty action, object, quality, etc. (all senses of nasty).
Feeling or speech marked by spite or malice; vitriol.
An animal toxin intended for offensive use, a biological poison delivered by bite, sting, etc. to protect an animal or to kill its prey.