ぽかん

ぽかん, ポカン, ぱかん, パカンpokan

adverb

  1. vacantly
  2. blankly
  3. absentmindedly
  4. openmouthed
  5. with one's mouth wide-open
  6. gaping
  7. flabbergasted
  8. with a whack

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences