Deeply calculating, reserved, and secretive in one's thoughts and intentions, making it difficult for others to fathom their true motives.
小李虽然平时不爱说话，但处理问题时表现出城府深沉的一面，总是能找到最稳妥的解决办法。
Though usually quiet, Li showed a deeply calculating and reserved side when handling problems, always finding the most secure solutions.
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