【适得其反】〖shì dé qí fn〗[run counter to one's desire; be just the opposite to what one wished; accomplish the very opposite; exactly opposite]

适情任欲改私制，

得售其奸祸根滋。

其命维新腐透顶，

反风灭火根深柢。

恰恰得到与预期相反的结果。just obtain and expect contrary of result. 同：事与愿违。反：如愿以偿、尽如人意。谜：刻印章。