Unnaturally formal, as prose (7)

I believe the answer is:

stilted

(Other definitions for stilted that I've seen before include "Stiff and pompous" , "Artificially formal or contrived" , "Stiff and unnatural" , "Unnatural sounding and overformal" , "Stiff, self-conscious" .)

I've seen this clue in The Washington Post.

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