| 疑 | yí | to doubt; to misbelieve; to suspect |
| 疑问 | yí wèn | a question; sth not understood; to query; interrogative (gramm.); CL:个 |
| 疑心 | yí xīn | suspicion; to suspect |
| 疑难 | yí nán | hard to understand; difficult to deal with; knotty; complicated |
| 疑虑 | yí lǜ | hesitation; misgivings; doubt |
| 疑惑 | yí huò | to doubt; to distrust; unconvincing; to puzzle over; misgivings; suspicions |
| 疑义 | yí yì | a doubtful point |
| 疑惧 | yí jù | misgivings |
| 疑似 | yí sì | to be suspected to be; deceptive; plausible but fallacious |
| 疑凶 | yí xiōng | suspected of murder; criminal suspect |
| 疑兵 | yí bīng | troops deployed to mislead the enemy |
| 疑冰 | yí bīng | ignorant; doubt stemming from ignorance; (a summer insect has no word for ice, Zhuangzi 庄子) |
| 疑问代词 | yí wèn dài cí | interrogative pronoun (谁, 什么, 哪儿 etc) |
| 疑问句 | yí wèn jù | a question (gramm.); an interrogative sentence |
| 疑团 | yí tuán | suspicion; doubts and suspicions; a chain of suspicions |
| 疑忌 | yí jì | jealousy; suspicious and jealous |
| 疑念 | yí niàn | doubt |
| 疑案 | yí àn | a doubtful case; a controversy |
| 疑犯 | yí fàn | a suspect |
| 疑狱 | yí yù | a hard legal case to judge |
| 疑病症 | yí bìng zhèng | hypochondriasis; hypochondria |
| 疑神疑鬼 | yí shén yí guǐ | to suspect everyone; overly suspicious |
| 疑窦 | yí dòu | a doubtful point |
| 疑阵 | yí zhèn | a diversion; a feint attack to mislead the enemy |
| 疑难问题 | yí nán wèn tí | knotty problem; intractable difficulty |
| 疑难解答 | yí nán jiě dá | trouble shooting; solution to difficulties |
| 疑云 | yí yún | a haze of doubts and suspicions |
| 疑点 | yí diǎn | a doubtful point |
