| láo | firm/fast |
| 牢 | firm sturdy fold (for animals) |
| 牢不可破 | indestructible |
| 牢什子 | nuisance |
| 牢固 | firm secure |
| 牢固的 | locked-in; deep-set; firm; vicelike; earthfast |
| 牢头 | jailer |
| 牢实 | firm and solid; secure and steady |
| 牢房 | jail cell prison cell |
| 牢房的观察孔 | a spyhole; a peephole |
| 牢房的铁窗 | an iron-barred window |
| 牢牢 | firmly safely |
| 牢狱 | prison |
| 牢稳 | stable; safe; secure; stable; secure; firm |
| 牢笼 | cage trap (e.g. basket, pit or snare for catching animals) fig. bonds (of wrong ideas) |
| 牢记 | to keep in mind to remember |
| 牢靠 | firm and solid robust reliable |
| 牢靠妥当 | reliable solid and dependable |
| 牢骚 | discontent complaint |
| 牢骚满腹 | querulous 2.to be full of complaints |