curiously enough; oddly enough; strange to tell
Fixed phrase used to introduce a surprising or unexpected fact, similar to 'strangely enough' or 'oddly enough' in English. Often appears at the beginning of a sentence.
Curiously enough, he has never been abroad.
Oddly enough, I don't remember anything about yesterday.
A fixed expression composed of 妙 (strange), な (attributive form of the auxiliary verb だ), 話 (story/topic), and だが (but). Literally 'it's a strange story, but...', used idiomatically to introduce an unexpected statement.