无力

dāo cóng tā wú lì de shǒu li luò xia

刀从她无力的手里落下。

The knife fell from her nerveless fingers.

huǒ là là de tài yáng kǎo de wǒ men xū ruǎn wú lì

火辣辣的太阳烤得我们虚软无力。

The hot sun sapped our energy.

tā jué de liǎng tuǐ wú lì

她觉得两腿无力。

She felt her legs weaken.

wú lì bāng zhù

无力帮助

be outside one's power to help

wú lì gù jí

无力顾及

have no strength to spare

wú lì fǎn kàng

无力反抗

powerless to resist