1) Doing nothing for a whole week is unacceptable for John.
2) For John, doing nothing for a whole week is unacceptable.
3) It is unacceptable for John to do nothing for a whole week.
4) Doing nothing for a whole week is unacceptable to John.
5) To John, doing nothing for a whole week is unacceptable.
6) It is unacceptable to John to do nothing for a whole week.
Which means:
a) John finds it unacceptable that he should do nothing for a whole week.
which means:
b) John finds it unacceptable that anyone should do nothing for a whole week.
and which means:
c) It is unacceptable that John should do nothing for a whole week.