From Longman Dictionary of Contemporary Englishuneatenun‧eat‧en /ˌʌnˈiːtn◂/ adjective not eaten I had to throw away the uneaten food.
Examples from the Corpus
uneaten• But they have to send some of it back to the kitchen, uneaten.• The mess of pizza fragments, uneaten chips, beer-cans, papers, had been swept into the litter bin.• We've got preliminary reports on the dishes of the uneaten food too.• Remove this rubbish, old pieces of sugared cotton-wool and other remains of uneaten food.• Any foods left uneaten must be removed after this time.• Refrigerate uneaten portion and reheat covered. 