| English | Russian |
| become weaker | завянуть (of a person) |
| become weaker | тухнуть |
| become weaker | потухнуть (pf of тухнуть) |
| become weaker | тухнуть (impf of потухнуть) |
| become weaker | увянуть (of a person) |
| become weaker | потухнуть |
| become weaker of a person | вянуть (impf of увянуть) |
| grow weaker | сникнуть |
| grow weaker | поникнуть (pf of никнуть) |
| grow weaker | поникнуть |
| grow weaker | никнуть |