がちがち

chattering (teeth)
frozen solid
overly serious

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がちがち

1 〔音〕 clatter clatter; chatter chatter; with a clatter [chattering sound].

●寒くて歯ががちがち鳴った. The cold made my teeth chatter. | My teeth chattered in the cold.

2 〔固くなっているようす〕 hard; solid; stiff.

●地面ががちがちに凍りついていた. The ground was frozen solid.

・彼はがちがちに緊張している. He is worried stiff. | He is stiff with nerves.

3 〔かたくなな考えに固まっているさま〕 bigoted; inflexible; stubborn.

●がちがちの警察国家 a rigid police state

・彼はがちがちの軍国主義者だ. He is a died-in-the-wool militarist.

・長年の慣行でがちがちに固まっている既得権 a vested right that has become solidly established with long usage.