expression, adverb
surprisingly; unexpectedly; considerably
Expresses that something is more than expected, often with a nuance of pleasant surprise or mild admiration. Used adverbially.
彼の料理はなかなかどうして、プロ並みだ。
His cooking is surprisingly good, on par with a professional's.
この店、なかなかどうして美味しいね。
This restaurant is unexpectedly delicious, isn't it?