The attack was very viscous.
The vicious dog was destroyed.
Here are some sentences.
They keep a vicious dog in that yard.
Her vicious attack took him by surprise.
the bear was vicious
my dog was vicious to my cat
Wolves are vicious and will destroy everyone he can catch.
The vicious fox ate the chickens. Even tame animals can become vicious if they are threatened.
Vicious is an adjective in a sentence.He snarled like a vicious animal.Being vicious isn't very nice. Try being polite.That dog is too vicious. Put it down.
The waitress has spread the vicious virus named influenza.
The vicious dog become placid after being tranquilized.
A vicious man was convicted for murder and was put in prison.
No, the word vicious is not an adverb.The word vicious is an adjective.The adverb form of this word is viciously.Here is a dictionary entry for the word "vicious" (click here).
The vicious shark attacked the swimmer.
The neighbor's vicious dog is loose again! That's an especially vicious rumor.
There is no noun for the word "vicious". "Vicious" is an adjective.