The courtyard is deep and secluded; no outsiders are in sight.
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Strongly literary. Modern writers reach for 邃密 to praise dense scholarship or describe a deep-set, hidden space — not for casual conversation.
memory
邃 (suì, deep/profound) + 密 (mì, dense/close) — picture an old library: deep and packed tight. Both senses (intellectual depth, physical seclusion) flow from that image.