严密 yánmì tight
tight; strict; closely controlled; rigorous and thorough
How to remember 严密: 严 strict + 密 secret = tight.
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How it is used
- Tight, airtight, rigorous - of organization, logic, or security - 严密监视 (yánmì jiānshì) to keep close watch; 逻辑严密 (luójí yánmì) tightly reasoned.
- Stresses no gaps or leaks; collocates with 防守、组织、监控、封锁.
- Contrast 严格 (yángé, strict about rules/standards); 严密 is about being seamlessly tight and gap-free.