a. 非常虚弱的，无力的 ≠ strong
a. 蹩脚的；无效的，站不住脚的 ≈ weak
a feeble argument/excuse/joke 无力的证据；站不住脚的借口；干巴巴的笑话
His voice sounded feeble and far away. 他的声音听上去既无力又遥远。
Don't be so feeble! Tell her you don't want to go. 别那么软弱了！告诉她你不想去。
BrE /əˌbriːviˈeɪʃn/