expression
curiously enough; oddly enough; to the point of being mysterious
Used adverbially to express that something is so unexpected or strange that it feels almost mysterious. Often followed by a clause describing the surprising fact.
不思議なくらい、彼の予言は当たった。
Curiously enough, his prediction came true.
不思議なくらい静かな夜だった。
It was an oddly quiet night.
Phrase composed of 不思議 (mysterious, strange) + な (attributive form) + くらい (extent, degree). The combination literally means 'to the extent of being mysterious' and is used adverbially.