知る means "know" and it represents "state". If you want to express that it is hard to understand, you can say 分かりにくい or 分かりづらい. It represents your negative feeling when you try to understand something.
2020년 6월 9일
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「知る」っていう単語は否定形ではあまり使われないんですね。ありがとうございます!
2020년 6월 5일
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If you mean "difficult to understand", you usually say "分かりにくい" or "分かりづらい".