His attentions to Miss King were now the consequence of views solely and hatefully mercenary; and the mediocrity of her fortune proved no longer the moderation of his wishes, but his eagerness to grasp at anything.
There are no more uses of "mediocrity" in the book.
Show samples from other sources
I know women whose entire personas are woven from a benign mediocrity.
Gillian Flynn -- Gone Girl
But after a time their unrelenting mediocrity palled, and I became weary of the sameness of the job, weary too of chain-smoking and the smog-shrouded view of Manhattan, and of pecking out such callous reader’s reports as the following, which I have salvaged intact from that dry and dispiriting time.