Unbuttoned, exposed, relaxed, unsealed, open, free, loose, unguarded, unfastened, casual. Each of these words is an antonym for the phrase "buttoned up". When someone is buttoned up, it often implies that they are uptight or tightly wound. Being unbuttoned or exposed can mean being more carefree, allowing oneself to be more open and relaxed. An unsealed or open attitude can lead to more fruitful communication and relationships, while being buttoned up can result in missed opportunities or misunderstandings. By exploring the antonyms for "buttoned up", we can paint a picture of a person who is comfortable in their own skin and willing to let others in.