messier42 The frame is lopsided To me this says that the frame is not aligned properly with itself. One side is longer than the corresponding opposite side. The shape is not rectangular.
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messier42The frame is lopsidedTo me this says that the frame is not aligned properly with itself. One side is longer than the corresponding opposite side. The shape is not rectangular. This is true of the frame itself whether it's hanging on a wall or not.
messier42The frame is askew/on a slantThese mean about the same
messier42 What about Tilt?The frame is [ tilted / on a slant / askew / crooked ].