firm and unyielding; rigid
Rare literary term describing something physically or metaphorically hard, stiff, and unyielding.
彼の信念は堅剛で、誰にも揺るがせられなかった。
His convictions were firm and unyielding, and no one could shake them.
Compound of 堅 (hard, firm) and 剛 (strong, sturdy). The exact historical derivation is uncertain; it is a rare Sino-Japanese word.