disapproval rating
Commonly used in political contexts to indicate the percentage of people who do not support a cabinet, leader, or policy.
The cabinet's disapproval rating exceeded 50%.
The rise in the disapproval rating is shaking the administration.
支持率 means 'approval rating', the opposite of 不支持率.
Compound of 不 (fu, 'not') + 支持 (shiji, 'support') + 率 (ritsu, 'rate').