KanjiJLPT N1
Stunned

be amazed, disgusted, shocked

Mnemonic

You open your mouth to scream but a massive tree topples and crashes inches from your face, leaving you utterly stunned. You just stand there—mouth frozen open, feet rooted to the ground like a tree—gaping in blank, speechless disbelief.
Additional thoughts
The kanji literally stacks mouth (口) on top of tree (木). Picture someone rooted like a tree with their mouth hanging open—the universal image of a stunned person. Mouth above, tree below = frozen, dumbfounded.
Quick recall
A mouth gapes wide above a tree as you stand rooted and stunned speechless.

Details

The keyword for 呆 is stunned. This kanji conveys the idea of being dumbfounded, dazed, or struck speechless with amazement or shock. It describes a state where one's mind goes blank, as if frozen in place due to surprise or disbelief. The character can also carry connotations of foolishness or absent-mindedness, as someone who appears stunned may look vacant or slow-witted.
On'yomi
ほう
Kun'yomi
ほけ.る、ぼ.ける、あき.れる、おろか