A person's nastiness is their characteristic of being hateful or spiteful. When you complain angrily about your meal at a restaurant, your nastiness isn't likely to help you get better food or service.

Nastiness in people is generally unpleasant and malicious. You might be disgusted by the nastiness of a political campaign, or alarmed by the nastiness of most comments on a newspaper's website. The nastiness of a place, on the other hand, is characterized by filth and squalor: "The apartment's nastiness was captured in the flies buzzing around the kitchen trash can." You could also talk about the weather's nastiness on a bitterly cold, rainy day.

Definitions of nastiness

n the quality of being unpleasant

“I flinched at the nastiness of his wound”
the quality of nice
unpleasant nastiness; used especially of nasty weather
Type of:
the quality of giving displeasure

n malevolence by virtue of being malicious or spiteful or nasty

bitchiness, cattiness, spite, spitefulness
Type of:
malevolence, malevolency, malice
the quality of threatening evil

n a state characterized by foul or disgusting dirt and refuse

filth, filthiness, foulness
Type of:
a state that is not conducive to health

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