2 Old HSK word(s): 
☊沉默 ** B ☊密封 ** D
Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.
密 dense, thick, close / intimate
封 letter, envelope / feudal
Hsk Characters:
HSK -Characters and beyond:
| Gb | Big5 | Eng | Rad | Mega | Triple | Multilingual |
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verschlossen ??? (S) [gui3 mi4] 
诡秘
Verschlossener Raum (S) [mi4 shi4 tui1 li3] 密室推理
Verschlossenheit (S) [bu4 tai4 shuo1 hua4] 不太说话
Verschlossenheit (S)Verschwiegenheit (S)mundtot (Adj)wortlos (Adj) [wu2 yan2] 无言
3.44 Geschlossen verschlossen + closed + 关闭 +
