Crossword puzzle clue "not changed"

Musician who once changed the middle letter of her stage name to a dollar sign, but later changed it back to a boring old "S"

Not easily changed

Changed but not seriously

Not changed

"It's ___ plan that can't be changed"

Youth changed into a bird, in a Greek myth

"You haven't changed ___!": 2 wds.

Hunter changed into a stag by Diana