HSK 3.0 11000 CHINESE WORDS
5 灰色 huīsè pessimistic, grey, ashy, grayness, ambiguous, grizzle, gloomy, gray, greyness, obscure 5 模糊 móhu dim, fade, befog, blur, mix up, slur, fade out, blear, confuse, obscure 6 隐藏 yǐncáng cache, hold back, hidden, blot_out, suppress, disguise, concealment, remain under cover, lurk, secrete, reserve, recess, hoodwink, dissemble, stash, veil, hold in, bury, hide, conceal, occult, mask, ensconce, cover_up, palliate, obscure, hoard 7 混淆 hùnxiáo to obscure, to confuse, to mix up, to blur, to mislead 7 默默无闻 mòmò-wúwén obscure and unknown (idiom), an outsider without any reputation, a nobody, an unknown quantity
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hồ đồ 
obscure
u huyền obscure
[ u ] : (1) to swell (part of the body), swollen; (2) (wet) nurse; (3) dark; (4) quiet, secluded
[ huyền ] : falling (tone)
hồ đồ obscure u huyền obscure [ huyền ] : falling (tone)