1 not having anything at all (idiom); utterly lacking
2 without two sticks to rub together
一无所知
yī wú suǒ zhī
1 not knowing anything at all (idiom); completely ignorant
2 without an inkling
三缄其口
sān jiān qí kǒu
1 (idiom) reluctant to speak about it
2 tight-lipped
上下其手
shàng xià qí shǒu
1 to raise and lower one's hand (idiom); to signal as conspiratorial hint
2 fig. conspiring to defraud
不胜其苦
bù shèng qí kǔ
1 unable to bear the pain (idiom)
不厌其烦
bù yàn qí fán
1 not to mind taking all the trouble (idiom)
2 to take great pains
3 to be very patient
不安其室
bù ān qí shì
1 to be discontented with one's home
2 to have adulterous relations after marriage (of women) (idiom)
不知所措
bù zhī suǒ cuò
1 not knowing what to do (idiom); at one's wits' end
2 embarrassed and at a complete loss
不计其数
bù jì qí shù
1 lit. their number cannot be counted (idiom); fig. countless
2 innumerable
以其人之道，还治其人之身
yǐ qí rén zhī dào , huán zhì qí rén zhī shēn
1 to use an opponent's own methods to obtain retribution (idiom, from Song dynasty neo-Confucianist Zhu Xi 朱熹); to get revenge by playing sb back at his own game
2 to give sb a taste of his own medicine
任其自然
rèn qí zì rán
1 to let things take their course (idiom)
2 to leave it to nature
3 laissez-faire
兄弟阋于墙，外御其侮
xiōng dì xì yú qiáng , wài yù qí wǔ
1 internal disunity dissolves at the threat of an invasion from outside (idiom)
两全其美
liǎng quán qí měi
1 to satisfy rival demands (idiom)
2 to get the best of both worlds
3 to have it both ways
4 to have one's cake and eat it too
其貌不扬
qí mào bù yáng
1 (idiom) nothing special to look at
2 unprepossessing
出其不意
chū qí bù yì
1 to do sth when least expected (idiom); to catch sb off guard
出其不意，攻其不备
chū qí bù yì , gōng qí bù bèi
1 to catch an enemy off guard with a surprise attack (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[Sūn zǐ Bīng fǎ])
力所能及
lì suǒ néng jí
1 as far as one's capabilities extend (idiom); to the best of one's ability
2 within one's powers
勉为其难
miǎn wéi qí nán
1 to tackle a difficult job (idiom)
2 to do sth reluctantly
只知其一，不知其二
zhǐ zhī qí yī , bù zhī qí èr
1 to know the first, but not know the second (idiom); only partial information