| 快速 | kuai4 su4 | quickly |
| 快 | kuai4 | fast |
| 加快 | jia1 kuai4 | to accelerate |
| 快乐 | kuai4 le4 | happy |
| 快讯 | kuai4 xun4 | newsflash |
| 很快 | hen3 kuai4 | quickly |
| 尽快 | jin3 kuai4 | with all speed |
| 愉快 | yu2 kuai4 | cheerful |
| 赶快 | gan3 kuai4 | with all haste |
| 快活 | kuai4 huo5 | cheerful |
| 快的 | kuai4 de5 | tantivy |
| 痛快 | tong4 kuai5 | happily |
| 不快 | bu4 kuai4 | slow |