众口难调（衆口難調）　

◎ 众口难调 zhòngkǒu-nántiáo

[it is difficult to cater for all tastes;it is hard to please all] 调:协调。原指饭菜难合众人的口味。比喻很难将众人意见协调一致。也比喻很难让所有的人都满意