1. having buttons that are not fastened
2. relaxed and informal in manner or behavior
Usage: informal

Examples

• He walked into the meeting with his shirt unbuttoned at the collar.
• The coat hung unbuttoned in the warm weather.
• She left her cardigan unbuttoned over her dress.
• The professor was surprisingly unbuttoned during the casual discussion.
• His unbuttoned style made the interview feel more like a conversation.
• The politician appeared more unbuttoned in the town hall setting.
• The jacket remained unbuttoned throughout the ceremony.