他的膝盖上有一块结痂的伤口。

There was a ___scabby patch on his knee.

拒绝帮助需要的人真是太卑鄙了。

It's really ___scabby to refuse help to someone in need.

这件外套看起来很破旧，袖口都磨破了。

This coat looks ___shabby with frayed cuffs.