IPA: /ˈkɛrˌwɔrn/
KK: /kɛrˈwɔrn/
Describing someone who looks tired or worried because of stress or sadness.
After weeks of sleepless nights, she had a careworn expression on her face.
Careworn → The word is formed from "care" (from Old English *caru*, meaning grief or anxiety) and "worn" (from Old English *werian*, meaning to wear or to be worn out). The term describes someone who appears worn out or tired due to the burden of worry or anxiety.
Think of someone who is burdened by 'grief' ('care') and looks 'worn out' — that's why careworn describes someone who looks tired from worry.