Grump (noun)

1. A person who is habitually ill-tempered or bad-tempered.
2. A person who is easily annoyed or angered, often seen as grouchy or irritable.

Origin:

Origin obscure.

Examples:

1. He was such a grump, always complaining about something.
2. He was known as a grump among his friends and family.
3. He woke up in a grump and had a bad day at work.
4. The old grump sitting at the corner of the street.
5. He was a grump when he was tired.