nontalker
/ˌnɑnˈtɔkər/
noun
- A person who does not talk much; someone who is quiet or reserved in conversation.
- At parties, he's a nontalker and prefers to listen.
- My new coworker is a nontalker, but she writes excellent reports.
- Being a nontalker doesn't mean you're unfriendly.
Antonyms