Tā de liǎn yīnchénchén de, shéi yě bù gǎn shuōhuà.
His face was so dark that no one dared speak.
Tips
memory
AABB-style reduplication of 阴沉 (overcast/gloomy) — the doubled 沉沉 'sinks the cloud lower'. Use it for two scenes: heavy gray skies before rain, and the face of someone who is angry but silent. The atmosphere is the same: heavy, pressing down.