密不透風 Save Sign in to save words Simplified: 密不透风 mìbùtòufēng ㄇㄧˋ ㄅㄨˋ ㄊㄡˋ ㄈㄥ sealed off impenetrable Character by character 密(mì)surname Mi 不(bù)no 透(tòu)penetrate 風(fēng)wind A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0