1. poorly matched or unsuitably paired

Examples

• The mismated couple had nothing in common and divorced within a year.
• Her elegant dress looked mismated with those worn sneakers.
• The antique chair seemed mismated with the modern furniture in the room.
• They were clearly mismated business partners with opposing goals.
• The bright colors appeared mismated against the neutral backdrop.
• His formal speech style was mismated to the casual audience.