无头案 wútóu'àn unsolved mystery Origin Definitions Defs Strokes Stroke Words Sentences Sents 无 無 wú adjectiveverb to not have to not have; there is no; lack; (as prefix) non-; un-; -less头 頭 tóu nounlocative top the top, end, or tip of an object; the beginning or end of an event案 àn noun legal case legal case; incident; a crime or event under investigation