[shuāi ruò]
（失去強盛的精力） weak; feeble; fall into a decline; debility; asthenia
suffer from neurasthenia
神經衰弱
The patient is very weak.
病人很衰弱。
He is very weak, for he has been ill for a long time.
他病了很久，身體衰弱。
（事物由強轉弱） collapse; traik; frail; weak; slack off; weaken; hyposthenia
The offensive has slacked off.
攻勢已經衰弱。