c. 1400, "having been given no mark," from un- (1) "not" + past participle of mark (v.). Similar formation in Old Norse umarkaðr. Meaning "not noticed or observed" is recorded from 1530s.
双语例句
1. He did die a pauper and is buried in an unmarked grave.
他死的时候一文不名，葬在一处无名墓穴中。
来自柯林斯例句
2. It's illegal for unmarked mini-cabs to ply for hire.
