infirm
词形变化：
同义词：
weak | feeble | frail | sickly | unsound | unstable | unhealthy | peaked | diseased | unwell | sick | invalid | ill | in poor health | ailing | debile | decrepit | rickety | sapless | weakly |
反义词：
firm |
词义辨析：
同义:
a.薄弱的; 虚弱的
weak
feeble
unstable
sickly
unsound
frail
同义参见:
peaked
diseased
invalid1
unhealthy
反义:
a.弱的; 优柔寡断的
firm
反义参见:
hale1