feeble

weak, feeble, frail, fragile

形容词 feeble:

1. pathetically lacking in force or effectiveness
   同义词：lame
2. lacking strength or vigor
   同义词：faint
3. lacking physical strength or vitality
   同义词：decrepit, debile, infirm, rickety, sapless, weak, weakly
4. lacking strength- Nathaniel Hawthorne
   同义词：nerveless

1. His feeble excuses soon tailed off (into silence).
   他的藉口站不住脚，很快就没词儿了(不作声了).
2. This was his fatal defect; he was of feeble will.
   这是他致命的弱点，他意志薄弱。
3. Having a feeble or unsteady gait; shaky.
   不稳的，虚弱的; 摇晃的
4. He bleated out a feeble excuse.
   他以微弱的声音作无力的辩解。
5. A sick person is often feeble.
   病人常常虚弱无力。
6. A feeble attempt is liable to fail.
   愚蠢的尝试多半是要失败的。

fee.ble

adj.（形容词）
fee.bler,fee.blest

Lacking strength; weak.
缺乏力量的；软弱的
Indicating weakness.
表现软弱的
Lacking vigor, force, or effectiveness; inadequate.See Synonyms at weak
缺乏活力、力量或效力的；不充足的参见 weak

来源：
Middle English feble
中古英语 feble
from Old French
源自 古法语
from Latin flôbilis [lamentable]
源自 拉丁语 flôbilis [不幸的，可悲的，令人惋惜的]
from flôre [to weep]
源自 flôre [哭泣]

【引伸】
fee.bleness
n.（名词）
fee.bly
adv.（副词）