Both Uses of

wretched

in

Prince Caspian: The Return to Narnia

Do let's get out of this wretched wood into the open as quick as we can.†
Chpt 9 *

wretched = miserable or very bad

At any other time he would have said something nice to Lucy, who was his favourite sister, for he knew how wretched she must be feeling, and he knew that, whatever had happened, it was not her fault.†
Chpt 11

Definition:

very bad

in various senses, including:

unfortunate or miserable -- as in "wretched prisoners sleeping on the cold floor"
of poor quality -- as in "wretched roads"
morally bad -- as in "The wretched woman stole his wallet."