Thank you for your attention. The most common example for this idiomatic expression is, of course, "hard of hearing", but there can be other cases, too, like "hard of breathing," for example. Also, there are cases with nouns, like "hard of comprehension." Hence the short form in the title.
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I agree with your point. Since people who follow this wants to improve their language, my suggestion is to list full idioms. May you can list similar idioms at the end of the post so that learners can get idea. This is just my suggestion :)