IPA: /juˈniːtəbl/
KK: /juˈniːtəbl/
Not suitable or safe to eat.
The food was left out too long and became uneatable.
Uneatable → It is formed from "un-" (meaning not) and "eat" (from Old English "etan", meaning to consume food) and "-able" (meaning capable of). The word "uneatable" means not capable of being eaten or unsuitable for consumption.
Think of something that is 'not' ('un-') suitable to 'consume' ('eat') — that's why it is called uneatable.