Morose is very commonly used, but it doesn't mean 'very sad."
A few of the "rather use" word above are just synonyms of the originals, maybe a more Latinate version, like "sagacious," which I never use because I think it sounds weakly pompous... maybe because Dickens often used it ironically and I can't hear it in any other voice now. If someone uses that to me I'll punch them in the throat.
In other cases, there's an meaning that goes beyond "very"-whatever, as in "exquisite."
It would be nice to hear a lot of the the others (parched, immaculate, gaunt, destitute) in conversation more often. They're very useful in writing.
Except "villainous."