密 On the HSK 4 vocabulary list, at CEFR level B2. mì ㄇㄧˋ dense close thick intimate close secret confidential bound form to send a private message to (sb) to DM Internet slang Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT