1. 已自由的：unbosom 吐露心事 | unbound 已自由的 | unbounded 极大的

2. 散装本：unbound document 散页文献 | unbound 散装本 | uNESCO(United Nations Educational, Scientific and Cultural Organization 联合国教科文组织

3. 未结合的、游离的：unblocking区间开通 | unbound未结合的、游离的 | unbounded electron自由电子

4. 無境界：unboosted vehicle == 无助推飞行器 | unbound == 無境界 | unbound mode == 非限制模

1.

adj

1. not restrained or tied down by bonds

2. not secured within a cover

e.g. an unbound book

3. not held in chemical or physical combination