程度・範囲・強調N1
〜のなんの
(it was) ever so... / to no end / like you wouldn't believe
Structure
い形 + のなんの
Explanation
I-adjective + のなんの: the degree is beyond words; colloquial.
Examples
合格の知らせを受けて、嬉しいのなんの。
When I got the news that I'd passed, was I ever happy.
初めての海外旅行は、楽しいのなんのって。
My first trip abroad was fun like you wouldn't believe.
Note
Colloquial, often ending with のなんのって. Synonymous with といったらない.