Antsy is in fact an adjective. It means very impatient. Antsy is only an adjective, not a noun or verb.

Antsy Pants was created in 2006.

Antsy means nervous or anxious. The image is of having ants crawling all over you. When you're antsy, you can hardly sit still. "Stop being so antsy," is a way of saying "Calm down."

She kept watching the clock,antsy for school to be over.

The word antsy is an adjective that describes a person who is agitated, impatient, or restless. A good example of the use of the word is: The man was feeling antsy awaiting his jury trial.