| 1 | 疑问 | 疑問 | yí wèn | yi2 wen4 | question; interrogation; doubt | | |
| 2 | 疑 | 疑 | yí | yi2 | to doubt; to suspect | | |
| 3 | 疑惑 | 疑惑 | yí huò | yi2 huo4 | to doubt; to distrust; unconvincing; to puzzle over; misgivings; suspicions | | |
| 4 | 疑虑 | 疑慮 | yí lǜ | yi2 lu:4 | hesitation; misgivings; doubt | | |
| 5 | 疑心 | 疑心 | yí xīn | yi2 xin1 | suspicion; to suspect | | |
| 6 | 疑问句 | 疑問句 | yí wèn jù | yi2 wen4 ju4 | question (grammar); interrogative sentence | | |
| 7 | 疑神疑鬼 | 疑神疑鬼 | yí shén yí guǐ | yi2 shen2 yi2 gui3 | to suspect everyone; overly suspicious | | |
| 8 | 疑似 | 疑似 | yí sì | yi2 si4 | to be suspected to be | | |
| 9 | 疑团 | 疑團 | yí tuán | yi2 tuan2 | doubts and suspicions; a maze of doubts; puzzle; mystery | | |
| 10 | 疑团冰释 | 疑團冰釋 | yí tuán bīng shì | yi2 tuan2 bing1 shi4 | All doubts were resolved. (idiom) | | |
| 11 | 疑团莫释 | 疑團莫釋 | yí tuán mò shì | yi2 tuan2 mo4 shi4 | cannot dissipate one's doubts (idiom) | | |
| 12 | 疑问词 | 疑問詞 | yí wèn cí | yi2 wen4 ci2 | Interrogative wording | | |
| 13 | 疑问代词 | 疑問代詞 | yí wèn dài cí | yi2 wen4 dai4 ci2 | interrogative pronoun (谁 , 什么 , 哪儿 etc) | | |
| 14 | 疑难杂症 | 疑難雜症 | yí nán zá zhèng | yi2 nan2 za2 zheng4 | dubious or hard-to-treat cases (medicine); hard cases | | |
| 15 | 疑问语调 | 疑問語調 | yí wèn yǔ diào | yi2 wen4 yu3 diao4 | question intonation (linguistics) | | |
| 16 | 疑信参半 | 疑信參半 | yí xìn cān bàn | yi2 xin4 can1 ban4 | half believing, half doubting (idiom) | | |
| 17 | 疑行无成 | 疑行無成 | yí xíng wú chéng | yi2 xing2 wu2 cheng2 | Hesitation leads to failure. (idiom) | | |
| 18 | 疑凶 | 疑兇 | yí xiōng | yi2 xiong1 | suspected of murder; criminal suspect | | |
| 19 | 疑义 | 疑義 | yí yì | yi2 yi4 | a doubtful point | | |
| 20 | 疑狱 | 疑獄 | yí yù | yi2 yu4 | a hard legal case to judge | | |
| 21 | 疑云 | 疑雲 | yí yún | yi2 yun2 | a haze of doubts and suspicions | | |
| 22 | 疑阵 | 疑陣 | yí zhèn | yi2 zhen4 | a diversion; a feint attack to mislead the enemy | | |
| 23 | 疑惧 | 疑懼 | yí jù | yi2 ju4 | misgivings | | |
| 24 | 疑案 | 疑案 | yí àn | yi2 an4 | a doubtful case; a controversy | | |
| 25 | 疑冰 | 疑冰 | yí bīng | yi2 bing1 | troops deployed to mislead the enemy; ignorant; doubt stemming from ignorance; (a summer insect has no word for ice, Zhuangzi 庄子 ) | | |