Sour, fermented, or off smell
Slimy or mushy flesh
Mold on the rind or cut surface
Dark, sunken, or wet spots
Flesh that is brown, gray, or unusually dull
Fizzy or bubbly texture
Very soft or collapsing rind
Sour or unpleasant taste
Excessive leakage or sticky juice
Visible signs of spoilage after being cut and stored too long