noun

• (uncountable) Lack of cleanliness.
• (uncountable) Dirt, filth.
• (uncountable) Indecency; corruption; unkindness, meanness, spite, harshness, cruelty.
• (uncountable) Unpleasantness, disagreeableness (to the senses).
• (countable) A nasty action, object, quality, etc. (all senses of nasty).