1. not appropriate or suitable for someone’s position, character, or circumstances
2. not attractive or flattering in appearance

Examples

• His rude behavior was unbecoming of a professional.
• The senator’s comments were unbecoming to his office.
• She felt the bright yellow dress was unbecoming on her.
• Such language is unbecoming of a teacher.
• The harsh lighting was unbecoming to everyone in the room.
• His arrogant attitude is unbecoming of a team captain.
• The formal gown looked unbecoming with those casual shoes.