Crotchety (adjective)

1. Bad-tempered, irritable, and prone to complaining.
2. Eccentric or whimsical in behavior or ideas.

Origin:

Derived from the word "crotchet" which means a musical note or a whimsical or eccentric idea.

Examples:

1. The crotchety old man was always grumbling about something.
2. Her crotchety behavior made it difficult for her to make friends.
3. His crotchety ideas were often met with skepticism.
4. The crotchety customer made a scene in the store.
5. The crotchety professor was known for his odd teaching methods.