Soft, mushy, or slimy texture
Visible mold or dark fuzzy spots
Strong sour, rotten, or unpleasant smell
Sprouting with shriveled or dried-out flesh
Large areas of discoloration or blackening
Leakage, wetness, or sticky residue
Outer layers that are excessively damp or decayed
Hollow, collapsed, or overly lightweight feel
Bitter, off, or unusual taste after cutting
Excessive dryness with papery layers peeling away and no usable flesh