[Azhrarn]

I think check/folding the turn is the best play.

It looks like he's not going to fold a pair. If he's a passive player, he's probably not going to semibluff or bluff. So let him tell you whether or net he's beating you.

In fact, considering how bad the flop is, you might want to check/fold the flop. If he's not going to fold a pair or a gutshot, why even bet? Against loose, straightforward players, it's often best to just let the cards speak.