ㄓㄣzhēnㄨㄟˋwèiㄇㄛˋㄅㄧㄢˋbiàn

  1. 真假清楚辨別隋書·三二·經籍》:戰國縱橫真偽莫辨諸子紛然淆亂。」

can't judge true or false (idiom)​; unable to distinguish the genuine from the fake, not to know whether to believe (what one reads in the news)​