c. 1300, "not easy to understand," from un- (1) "not" + clear (adj.). Similar formation in Middle Dutch onclaer, Dutch onklaar, German unklar, Old Norse uklarr, Danish uklar, Swedish oklar. Of persons, in sense of "uncertain, doubtful," it is recorded from 1670s.
实用例句
1. Just what the soldier was doing in Bireij is unclear.
就连那个士兵在比雷杰干什么都不清楚。
来自柯林斯例句
2. To this day, it's unclear whether he shot himself or was murdered.
至今尚不清楚他究竟是饮弹自杀还是被谋杀。
来自柯林斯例句
3. "Things are moving ahead."— I found that statement vague and unclear.
