Tall pantry cabinet next to sloping wall

I'm planning on making a pantry cabinet that's about 90" high and 21" wide. The wall that will be to the right of it has about 1/2" of slope over that height. Fixing the slope of the wall doesn't seem practical, and the only other options I can see are to leave a large enough gap to mask the differing gap, put in a sloping filler piece, or tilt the whole cabinet (the other side has a refrigerator which needs a 2" gap anyway, so it won't be too visible). I'm not crazy about any of these ideas and would love some opinions as to what's the least offensive. Or any genius ideas that hasn't occurred to me would be welcome too!