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.
٩ يونيو ٢٠٢٠
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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!
٥ يونيو ٢٠٢٠
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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".