Grouch (noun)

1. A bad-tempered or surly person.
2. A person who is easily annoyed or angered.

Origin:

from middle english grouchen, from old english grōcian to grumble; akin to old high german grōchen to grumble.

Examples:

1. He was such a grouch that no one wanted to be around him.
2. She woke up on the wrong side of the bed and was acting like a grouch.
3. Grouches are often described as bad-tempered or surly people.
4. Grouches are also known to be easily annoyed or angered.
5. The term grouch can also be used as a verb meaning to complain or grumble.