Whatever you want to call it when text can barely be read, falls out of alignment, or disapears entirely because a font renders at a fraction or multiple of the

Whatever you want to call it when text can barely be read, falls out of alignment, or disapears entirely because a font renders at a fraction or multiple of the size of the desired font, despite being the same "size" in "centimeters" or "pixels" or "ems", or when hair-thin text that looks great on an iRetina is rendered on low-density screens, etc.