"He was febrile and weak", by the by, sounds good to me - I don't think many college seniors are capable of conjuring up a line like that. Most college seniors would not even know of this word, much less to be able to use it, such is the general state of English learning in this country.

However, the jury is still out on whether you've used that word correctly. Your professor could've changed "febrile" to "feeble" for one of two reasons - again, I am conjecturing. First, he thought you used the wrong word if you had not indicated in the rest of your composition a situation pertaining to the person possibly having a fever. Second, he tried to rein you in on the use of big words. He preferred that you use simple and modest words.

Either way, I think you've done a great exercise. Learn from it.

I've learned from it. Thank you, Perplex. You are my teacher.

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