KanjiJLPT N3
Sad

grieve, sad, deplore, regret

Mnemonic

Your heart has been thrown into a dark prison cell. It beats against the cold iron bars, desperate for warmth, for connection — but no one comes. Day after day, it pounds weaker and weaker. The crushing isolation of a heart locked away with no hope of release is what makes you profoundly sad.
Additional thoughts
Picture a literal glowing heart behind bars in a dungeon, slowly dimming. The visual of something so vital and warm trapped in something so cold and confining drives the emotion home.
Quick recall
A heart locked in prison, slowly fading in isolation, makes you deeply sad.

Details

The keyword for 悲 is sad. This kanji conveys a deep sense of sorrow, grief, or heartfelt sadness. It represents the emotional pain one feels in response to loss, misfortune, or suffering. The character captures not just a fleeting unhappiness but a profound, often poignant feeling of melancholy that resonates deeply within the heart.
On'yomi
Kun'yomi
かな.しい、かな.しむ