- 衰
- decline
- 衰
- weaken
- 衰
- languish
- 衰
- wane
- 衰竭
- exhaustion
- 衰竭
- prostration
- 衰竭
- breakdown
- 衰老
- be old and sapped
- 衰老
- be senile
- 衰老
- decline in years
- 衰落
- decline
- 衰落
- ebb
- 衰落
- decay
- 衰弱
- weak
- 衰弱
- enervate
- 衰弱
- languishing
- 神经衰弱
- neurasthenia
- 衰弱
- weaken
- 衰弱
- sap
- 衰弱
- lose momentum
- 衰退
- decline
- 衰退
- fail
- 衰退
- wane
- 衰退
- dwindle away
- 衰退
- physically deteriorate
- 我记忆力衰退。
- My memory is failing [or declining] .
- 衰亡
- decline and fall
- 衰亡
- crumble
- 衰亡
- die out
- 早衰
- premature senility
- 早衰
- early decrepitude
- 半衰期
- half-life
- 肾功能衰竭
- kidney [or renal] failure