Weak
You have two bows but they're both covered in ice. This has made them very weak.
Just look at these weak, iced over bows. If you tried to draw back their strings they'd snap into a million pieces.
じゃく
よわ
None
You give up on your trip and bring the weak bows back to your car, but it's stuck in the ice and snow. You decide to use the bows as a jack (じゃく) to try to get your car unstuck. Unfortunately, they're just too weak and they break in half.
Now you're stuck with two weak broken bows and no jack. Ice is lame.