The skin is very dark and the avocado feels mushy all over
The flesh has large brown or black areas
The flesh looks stringy, dried out, or grayish
It smells sour, rancid, or like rotten fruit
There is mold on the skin or inside the fruit
The stem area is black, sunken, or moldy
The avocado tastes bitter, sour, or off
It has a fermented smell or taste
The flesh is slimy or watery
The avocado has been cut open and left too long, turning brown throughout