无咖啡因 wúkāfēiyīn decaffeinated 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咖啡因 kāfēiyīn noun caffeine caffeine; a bitter white alkaloid found in coffee, tea, and cocoa, used as a stimulant and diuretic