Inedible as in anything that isn’t food (ranging from something that would be dangerous, like glass, poisonous plants, or uranium, to something that is safe to eat but unpleasant with no nutritional value, like cardboard.) Eating the thing will be safe and painless.
I love how this question popped up right under a relevant comic -
You’d barely be able to taste a 1/3 cup of bleach in those cupcakes. Nobody understands flavors these days.