1. (人或动物)独处的，独居的
    A person or animal that is solitary spends a lot of time alone.

solitary的反义词

    e.g. Paul was a shy, pleasant, solitary man...
           保罗是一个羞怯、友善、惯于独处的男人。
    e.g. They often have a lonely and solitary life to lead.
           他们常常过一种独居的孤独生活。

2. (行动)单独的，独自的
    A solitary activity is one that you do alone.

    e.g. His evenings were spent in solitary drinking.
           他晚上的时间都是靠独自喝闷酒打发。

3. (人或物)孤单的，孤零零的
    A solitary person or object is alone, with no others near them.

    e.g. ...the occasional solitary figure making a study of wildflowers or grasses.
           偶尔出现的研究野花野草的孤单身影

4. 同 solitary confinement
    Solitary is the same as solitary confinement .

    e.g. Tom was in solitary across the way from me.
           汤姆在我对面被单独监禁。