[fǎn]
on the contrary; instead; but
Guangzhou is south of Nanjing, but contrary to what one might suppose, it is not as hot.
广州在南京的南面，反而没有南京热。
Instead of abating, the wind is blowing even harder.
风不但没停，反而越刮越大了。
I meant to help him; unexpectedly I have brought him trouble.
我想帮助他， 没想到反而给他添了麻烦。