| 信 | xìn | letter; mail; to trust; to believe; to profess faith in; truthful; confidence; trust; at will; at random |
| 信号 | xìn hào | signal |
| 信心 | xìn xīn | confidence; faith (in sb or sth); CL:个 |
| 信任 | xìn rèn | to trust; to have confidence in |
| 信息 | xìn xī | information; news; message |
| 信用 | xìn yòng | to trust; credit (commerce); trustworthiness; creditworthiness |
| 信贷 | xìn dài | credit; borrowed money |
| 信念 | xìn niàn | faith; belief; conviction |
| 信件 | xìn jiàn | a letter (i.e. sent in the mail) |
| 信赖 | xìn lài | to trust; to have confidence in; to have faith in; to rely on |
| 信徒 | xìn tú | believer |
| 信服 | xìn fú | to believe; to be convinced; to convince sb |
| 信奉 | xìn fèng | belief; to believe (in sth) |
| 信封 | xìn fēng | envelope; CL:个 |
| 信誉 | xìn yù | prestige; distinction; reputation; trust |
| 信条 | xìn tiáo | creed; article of faith |
| 信阳 | Xìn yáng | Xinyang prefecture level city in Henan |
| 信义 | xìn yì | good faith; honor; trust and justice; Xinyi or Hsinyi district of Taipei City 台北市, Taiwan; Xinyi or Hsini district of Keelung City 基隆市, Taiwan; Xinyi or Hsini township in Nantou county 南投县, central Taiwan |
| 信号灯 | xìn hào dēng | signal light; car indicator |
| 信托 | xìn tuō | to entrust; trust bond (finance) |
| 信息论 | xìn xī lùn | information theory |
| 信纸 | xìn zhǐ | letter paper; writing paper |
| 信从 | xìn cóng | to trust and obey |
| 信用证 | xìn yòng zhèng | letter of credit |
| 信仰 | xìn yǎng | to believe in (a religion); firm belief; conviction |
| 信令 | xìn lìng | signaling (engineering) |
| 信仰者 | xìn yǎng zhě | believer |
| 信佛 | xìn Fó | to believe in Buddhism |
| 信使 | xìn shǐ | messenger; courier |
| 信使核糖核酸 | xìn shǐ hé táng hé suān | messenger RNA, mRNA |
| 信函 | xìn hán | letter; mailbox |
| 信口开河 | xìn kǒu kāi hé | to talk off the cuff (idiom); idle talk |
| 信口雌黄 | xìn kǒu cí huáng | to talk off the cuff (idiom); idle talk |
| 信噪比 | xìn zào bǐ | signal-to-noise ratio |
| 信报 | xìn bào | abbr. for 信报财经新闻, Hong Kong Economic Journal |
| 信报财经新闻 | xìn bào cái jīng xīn wén | Hong Kong Economic Journal |
| 信天翁 | xìn tiān wēng | albatross (family Diomedeidae) |
| 信孚中外 | xìn fú zhōng wài | to be trusted both at home and abroad (idiom) |
| 信守 | xìn shǒu | to abide by; to keep (promises etc) |
| 信宜 | Xìn yí | Xinyi county level city in Maoming 茂名, Guangdong |
| 信宜市 | Xìn yí shì | Xinyi county level city in Maoming 茂名, Guangdong |
| 信宿 | xìn sù | (ancient) to lodge for two nights |
| 信实 | xìn shí | to believe something to be true |
| 信州 | Xìn zhōu | Xinzhou district of Shangrao prefecture level city 上饶市, Jiangxi |
| 信州区 | Xìn zhōu qū | Xinzhou district of Shangrao prefecture level city 上饶市, Jiangxi |
| 信差 | xìn chāi | messenger |
| 信得过 | xìn de guò | trustworthy; reliable |
| 信德省 | Xìn dé shěng | Sindh province of Pakistan |
| 信息中心 | xìn xī zhōng xīn | information center; abbr. for Information center for human rights and democracy 中国人权民运信息中心, Hong Kong |
| 信息化 | xìn xī huà | informatization (the Information Age analog of industrialization) |
