Crabby (adjective)

1. Bad-tempered, irritable, or grouchy.
2. Easily irritated or annoyed.

Origin:

From the word "crab" meaning "a marine crustacean with a broad carapace, a pair of eyes on stalks, and five pairs of legs, some of which are modified for grasping and crushing".

Examples:

1. The old man was always crabby and grumbling.
2. The employee was crabby with the customers.
3. The crabby teacher was known for her strict rules.
4. The crabby baby was crying all night.
5. The crabby patient was difficult to deal with.