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).
A feeling of long-lasting ire for another, sometimes to the point of hatred, over a perceived wrongdoing; bitterness.
Rancidity, rankness.