| Word | Definition 1 | Definition 2 | Example 1 | Example 2 | Example 3 | |
| ubiquitous (adj) | 十分普遍的, 无所不在的 | |||||
| ultramundane (adj) | 超凡脱俗的 | |||||
| ultraviolet (adj) | 紫外的 | |||||
| undermine (v) | 暗中颠覆 | 削弱, 侵蚀 | The large discrepancy between the report and the truth severely undermined public trust in the newspaper. | |||
| undisputed (adj) | 毫无疑问的 = undoubtedly | |||||
| unearth (v) | 发掘 | |||||
| uniformly (adv) | 相同地, 都 | Growth prospects around the world are uniformly grim. | ||||
| unprecedented (adj) | 空前的 | |||||
| unpromising | 不容乐观的 | |||||
| unrivaled (adj) | 无与伦比的, 无双的 | |||||
| Uranus (n) | 天王星 | |||||
| urban (adj) | 城市的 | |||||
| utensil (n) | 用具 |