apolitical means indifferent to or uninvolved in politics—like someone who skips elections because they don't care about the drama, treating it like background noise. unpolitical is basically the same but rarer, just meaning not political in nature or without political bias, like a math equation that ignores elections entirely. the difference is slim; unpolitical focuses more on inherent neutrality, while apolitical implies active disinterest.
merriam-webster
https://www.merriam-webster.com/dictionary/unpolitical
wikidiff