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contrariety (n.)

c. 1400, "state or quality of being contrary, extreme opposition," from Old French contrarieté, from Late Latin contrarietatem (nominative contrarietas) "opposition," noun of quality from contrarius "opposite, opposed; contrary, reverse," from contra "against" (see contra (prep., adv.)). Meaning "something contrary to or extremely unlike another" is from mid-15c.