KanjiJLPT N1
Sturdy

sturdy, strength

Mnemonic

You drive a knife into the face of a mountain, expecting the rock to split. Nothing happens—not even a scratch. You stab again and again, but the mount won't yield. Finally your knife snaps in half. This rock is absolutely sturdy—harder than any blade forged by man.
Additional thoughts
Picture the broken knife falling at the base of an impossibly solid mountain. The mountain's refusal to chip even slightly is the essence of sturdy, unyielding toughness.
Quick recall
A knife shatters against a mountain that is utterly sturdy.

Details

The keyword for 剛 is sturdy. This kanji conveys the idea of something that is hard, strong, and unyielding, suggesting both physical toughness and firmness of character. It describes a robust, unwavering quality that resists bending or breaking under pressure. In a broader sense, it can refer to moral fortitude and an indomitable spirit that stands firm against adversity.
On'yomi
ごう

Used in vocab