Nosy (adjective)

Inclined to intrude into the affairs of others; excessively curious.

Origin:

Noisy + -y.

Examples:

1. She was always so nosy and wanted to know everything about everyone.
2. He was nosy and always wanted to know what was going on.
3. She's nosy by nature and always asking questions.
4. I don't like nosy people who always want to know my business.
5. The nosy neighbor was always peeking through the window.