Contrary to; against (expectations, rules, predictions). Indicates a result or situation opposite to what was expected or prescribed.
予報に反して、今日は一日中雨が降った。
Contrary to the forecast, it rained all day today.
上司の指示に反して勝手に決めてはいけない。
You mustn't decide on your own against your boss's instructions.
期待に反して、彼の発表は短時間で終わった。
Contrary to expectations, his presentation finished quickly.