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Use "unaccessible" in a sentence
"I find Feynman to be kind of unaccessible unless you are already familiar with the material being discussed."
"A quick trip over to Herdict shows that more people are reporting Facebook unaccessible than accessible in the country right now."
"Well as I've argued before, the concept of open access should be more than a legal mechanism to facilitate access to content that would otherwise be unaccessible under traditional copyright systems."