chatterbox

Example:She's a quiet person who prefers to observe more than participate in conversations.

Definition:A person who is not often heard talking and tend to be reserved in conversation.

Example:He's a shy person who tends to avoid small talk and prefers the company of a few close friends.

Definition:A person who is reserved, nervous, or timid, especially when meeting new people or in unfamiliar situations.

Example:She is a reserved person who does not readily join in conversations.

Definition:A person who is not inclined to reveal much about themselves or to make excessive small talk.