Danglars comprehended the full extent of the wretched fate that overwhelmed Dantes; and, when Napoleon returned to France, he, after the manner of mediocre minds, termed the coincidence, "a decree of Providence."
It is true, between ourselves, that M. de Morcerf is one of the most assiduous peers at the Luxembourg, a general renowned for theory, but a most mediocre amateur of art.
There are no more uses of "mediocre" in the book.
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the caliber of the students has gone from mediocre to above average
They improved the quality from mediocre to above average