こわばる の訳語→ harden inert obdurate rigid stiff stiffness tense tighten
じっと の訳語→ absolutely becalmed carefully close closely courteously hard intently keenly long motionless motionlessly openly patiently pretty quietly sharply silently simply sit solemnly square steadily steady still straight thoughtfully through tight unwaveringly
翻訳者の腰痛防止にオススメ!