のか見当もつかない

have no idea

→ の
phrase Rare #36,684
have no idea Used after a question word or question phrase, such as 何を, 何時, or どうなる, to say that you have absolutely no idea what, when, or how something is. 見当もつかない literally means “cannot even make a guess.”
JA: 彼がどこへ行ったのか見当もつかない。
EN: I have no idea where he went.

いろいろ問題が昼間眠ってしまうなぜならその身振り何を指すのか見当もつかない

There are all sorts of problems, and I end up falling asleep during the day because… I have no idea what that gesture is supposed to mean.

— どん底作家の人生に幸あれ! (2019)

明日の天気がどうなるのか見当もつかない

I have no idea what the weather will be like tomorrow.

彼らが何を話してるのか見当もつかない

I have no idea what they’re talking about.

何時のか見当もつかない

I have no idea what time it is.