Unsell rhymes with:
ancel, ansel, ancel, ansel, accel, ancel, ansel, cel, cell, cosell, decelle, desselle, excel, fascell, giselle, gsell, marcel, marcelle, maxell, mousel, noxell, outsell, percell, procell, purcell, resell, roussel, roussell, rousselle, sel, sell, selle
Unsell sounds like:
unanimously, uncle, uncoil, uncool, uneasily, unequal, unglue, unicycle, uniquely, unocal, unseal, unshackle, unusual, unusually, unwisely