Adjective
The word is derived from nasty
Diplomacy is to do and say The nastiest things in the nicest way. Isaac Goldberg
I'm one-hundred-fifty miles off Cape Horn, both autopilots are broken, and my boat is drifting toward one of the nastiest chunks of ocean on the face of the earth. Abby Sunderland
I suppose the shock of recognition is one of the nastiest shocks of all. Donna Tartt
A wall is a very big weapon. It's one of the nastiest things you can hit someone with. Banksy
Stupidity, especially in its nastiest forms of racism and superstition. Christopher Hitchens
Diplomacy is to do and say the nastiest thing in the nicest way. American Proverb