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“more infamous”
infamous (adjective), more infamous, most infamous
So bad as to earn someone an extremely unacceptable reputation: "Benedict arnold, an American Revolutionary general, was guilty of the infamous crime of treason."
This entry is located in the following units:
fa-, fam-, fan-, fant-, fat-, -fess; fab-, fabul-
(page 4)
-ous, -ious, -eous
(page 11)