against expectation

Against expectation, the underdog team won the final match easily.

出乎意料，弱队轻松赢得了决赛。

The train arrived at the station on time, against expectation.

火车出乎意料地准时到站了。

Against expectation, she agreed to the plan without any argument.

出乎意料，她没有任何争论就同意了这项计划。