feebler
adj. 微弱的，无力的；虚弱的；薄弱的（feeble 的变形）
例句
Grandmother has been getting feebler lately.
近来祖母愈益衰弱了。
My grandfather is a lot feebler than when I last saw him.
我的爷爷比我上次见他的时候虚弱了许多。
Its economy is strained; witness the ever feebler dollar.
经济停滞不前，美元的虚弱就是明证。
