Maybe Hitler is elected but doesn't obtain any of the dictatorial powers he got OTL, and every radical change he wants to introduce gets voted down every single time?
Basically, instead of him not wanting to do anything, he simply can't and what he can is extremely mundane.
Looking at the results of the
March 1933 Reichstag election, the Enabling Act would have needed 432 votes to pass if all MPs were in attendance. If you add up the seats for the Nazis, the DNVP's coalition, the Centre Party, and the Bavarian People's Party, you get...432 votes. It actually passed 444-94, so some of the MPs from smaller parties must have voted in favor as well, with the Communists not allowed to attend and the Social Democrats with a little over 3/4 of their MPs present and voting No.
So for the Enabling Act to fail, one of two things needs to happen:
1) The smaller parties all vote against it, the full Social Democratic and Communist caucuses are there to vote No, and at least one MP from the larger parties voting in favor is absent. I don't know how realistic that is re: the smaller parties. One of them, the Agricultural League, is described on Wikipedia as a Nazi ally and had a single MP, so getting that person to vote No might be a tall hill to climb.
2) The Centre and/or BVP decide to oppose it. IIRC, Bruning strongly urged opposition behind the scenes, with the Centre's leader, Ludwig Kaas, deciding to support it partly because he expected that the Nazis would just seize power by other means if it failed.
Of course, point #2 raises the question of whether the Enabling Act failing is sufficient to prevent the totalitarian Nazi regime of OTL from coming into existence. Would the Reichswehr and the regular civilian police have had a prayer of defeating an armed uprising by the SA (which I assume is the sort of thing that Kaas feared)?