Odds are they're bent or out of true because of a side impact. That usually bends the rims, but it's a question of degree. If the runout is gradual and spread over a decnt distance, then the rim is probably reasonably OK, and thr wheel can be trued. If there's fast local changes in true, the rim is likely bent and will resist efforts to true.
But even if the rim is bent, all may not be lost. Skilled mechanics can bring back many seemingly hopeless cases.
IMO, a photo here won't help, unless it's well beyond the pale. I suggest you consult with a local wheel builder or skilled mechanic and see what he (or she) has to say.
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