If you don't use it, you lose it. Spaced repetition is "using it", even if only artificially. If you want to completely avoid spaced repetition you are going to

If you don't use it, you lose it. Spaced repetition is "using it", even if only artificially. If you want to completely avoid spaced repetition you are going to have to find some other way to consistently use whatever you have learned, which arguably might end up being more strenuous than using a spaced repetition system like Anki because these try to figure out the minimum frequency of repetition you require to retain some piece of knowledge. And they're not bad at it. The intervals between which you see a specific card usually grow to a couple months quickly. However, relearning something takes very little time compared to learning it from scratch, so unless you need to relearn things very often it might not even be worth worrying about much.