After a few days, the fresh flavor of the food became (a) stale solitude.
I'm a bit confused about the word solitude. It sounds countable and non-countable at the same time. So I don't know whether to use an "a" or not.
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Solitude when used in a countable sense can mean "a time, event, or thing where solitude featured prominently", in an uncountable sense it means "the quality of being alone and uninterrupted."
So it depends on whether you want to equate flavor with something that has solitude as a prominent attribute (which would be inferred from context) or equate it with the quality of solitude directly.