这里的信号很弱。

Zhèlǐ de xìnhào hěn ruò.

The signal here is very weak.

她最近的身体很弱。

Tā zuìjìn de shēntǐ hěn ruò.

She’s been in poor health lately.

不要小看你的对手，他们也不弱。

Búyào xiǎokàn nǐde duìshǒu, tāmen yě bù ruò.

Don’t underestimate your opponents—they’re not weak either.