1. An individual who is cautious, restrained, or reticent in social interactions; someone who does not readily express emotions or share personal information
She is a reserved person who prefers listening to talking at parties.
Ela é uma pessoa reservada que prefere ouvir a falar em festas.
2. Someone who maintains emotional distance and does not engage openly with others
As a reserved person, he rarely reveals his true feelings.
Como pessoa reservada, ele raramente revela seus verdadeiros sentimentos.