JJ against a very passive opponent

[Pog0]

c/f or c/r/f. The problem is after you c/r the flop, he's calling down with AA or KK, so his lack of agression is by no means an indication that you're ahead. You could c/r the flop, bet the turn, then check/fold the river (assuming he's checking behind AK, betting others). This way he has to pay to draw and you can dump once you're sure you're behind.

The only reason I advocate c/r/f on the flop rather than b/f is that if I bet and am raised, I'm not convinced I'm beat (logic being, he raises PF so seldomly that he feels somewhat commited to the pot once he does, hence he may raise AK here while he wouldn't dream of 3betting less than KQ to a c/r)