紧密 jǐnmì inseparably close
How to remember 紧密: 紧 tight + 密 secret = inseparably close.
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How it is used
- Close-knit / tightly connected (inseparable) - 紧密联系 (jǐnmì liánxì) closely linked; 紧密合作 close cooperation.
- Figurative closeness of relationships and connections, not physical tightness. Contrast 密切 (mìqiè, close, a near-synonym for relations): both fit 关系; 紧密 stresses being bound tightly together.