While I’m not sure it is necessarily a word high schoolers ought to know (although every time I qualify a blog post with those words, I find myself wondering if there is any word a high schooler doesn’t need to know), here nonetheless is a context clues worksheet on the adjective abstruse. It means, simply, “difficult to comprehend.”
If that doesn’t quite cover conceptually what you mean students to understand, then perhaps this worksheet on the adjective recondite will supply the needed depth of understanding. It means “hidden from sight, concealed,” “difficult or impossible for one of ordinary understanding or knowledge to comprehend,” and “of, relating to or dealing with something little known or obscure.”
Incidentally, I have always been impressed by the fact, and have tried to impress students with it as well, that the great rapper Guru (who died in 2010, I was sad to learn while writing this post) managed to work recondite into his song “Jazz Thing” in reference to the late, great Thelonious Monk.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.
Mark's Text Terminal 
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