A mean act.
The condition, or quality, of being mean (any of its definitions)
A nasty action, object, quality, etc. (all senses of nasty).
Lack of cleanliness.
Indecency; corruption; unkindness, meanness, spite, harshness, cruelty.
Dirt, filth.
Unpleasantness, disagreeableness (to the senses).