8 Old HSK word(s): ☊暗 ** B ☊黑暗 ** B ☊暗暗 ** C ☊暗淡 ** D ☊暗杀 ** D ☊暗示 ** D ☊暗中 ** D ☊阴暗 ** D
变暗* * 发暗* * 灰暗* * 昏暗* * 天昏地暗* * 幽暗* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

幽 quiet, secluded, tranquil / dark
暗 dark / obscure / in secret, covert

Hsk Characters: 暗 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
暗 6697 + 暗 + + dark / obscure / in secret, covert 日 音 Sun 音 (TON_SCHALL) an4 +

Korean:

暗 + 暗 어두울 암 (어둡다: dark)
闇 + 暗 닫힌문암 (a door which was/has been closed)
晻 + 暗 어두울 암
2 NHSK word(s): 暗* 4 an4dark/ gloomy/ hidden/ secret/ muddled/ obscure/ in the dark 暗示* 6 an4 shi4to hint/ to suggest/ suggestion/ a hint
KOREAN6000 word(s):
1 KOREAN 2500 New HSK words):
暗 + àn 어둡다. eodubda.
3 KOREAN Sentence(s):
这房间太暗。 + 방이 너무 어두워요. bangi neomu eoduwoyo.
黑暗的和明亮的 + 어두워요 그리고 밝아요 eoduwoyo keurigo balgayo
黑夜是黑暗的 + 밤은 어두워요. bameun eoduwoyo.