かたい
stiff, tight
Walled in and set that way for years, which about a person means he will not hear a new idea. The same carton かた as 固まる, set solid. My boss: かたい.
Three かたい: 硬い physically hard, 固い firm and set, and 堅い solid or reliable. 固い is the one for a stubborn head.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.