Synonyms for On the contrary:

adv

differently (adverb)
contrarily.
vice versa (adverb)
contrariwise.

adv.

all (adverb)
contrarily, contrariwise, to the contrary.
differently (adverb)
contrarily.
vice versa (adverb)
contrariwise.

n.

on the contrary (noun)
contrarily, contrariwise, to the contrary.

Other synonyms:

Other relevant words:
contrarily.