onomatopoeia for cluelessness


Is there an オノマトペ for when you're absolutely clueless or expected to do
something, but cannot?




> ポカーン

seems like the closest to me. It is often associated with a blank stare.

jisho.org has `vacantly; blankly; absentmindedly (​Onomatopoeic or mimetic
word)` as the definition of the root
[ぽかん](https://jisho.org/search/%E3%81%BD%E3%81%8B%E3%82%93).

Example images: [ポカーン1](http://seiga.nicovideo.jp/seiga/im1077704) and
[ポカーン2](https://www.ac-
illust.com/main/detail.php?id=870244&word=%E5%88%86%E3%81%8B%E3%82%89%E3%81%AA%E3%81%84%E3%81%97%E3%82%8D%E3%81%8F%E3%81%BE)

