殆

危殆

wēi dài

grave danger

丧失殆尽

sàng shī dài jìn

to be used up

学而不思则罔，思而不学则殆

xué ér bù sī zé wǎng , sī ér bù xué zé dài

To learn without thinking is confusing, to think without learning is dangerous (Confucius)

殆尽

dài jìn

almost exhausted; nearly depleted; practically nothing left

百战不殆

bǎi zhàn bù dài

to come unscathed through a hundred battles (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3]); to win every fight

知己知彼，百战不殆

zhī jǐ zhī bǐ , bǎi zhàn bù dài

know yourself and know your enemy, and you will never be defeated (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3])

知彼知己，百战不殆

zhī bǐ zhī jǐ , bǎi zhàn bù dài

knowing the enemy and yourself will get you unscathed through a hundred battles (idiom, from Sunzi's "The Art of War")