1. 流利的;流畅的
    Someone who is fluent in a particular language can speak the language easily and correctly. You can also say that someone speaks fluent French, Chinese, or some other language.

fluent的反义词

    e.g. She studied eight foreign languages but is fluent in only six of them...
           她学习了8种外语，但是只能流利地说其中 6 种。
    e.g. He speaks fluent Russian.
           他说一口流利的俄语。

2. (语言或文字)流畅的，熟练的;文笔好的
    If your speech, reading, or writing is fluent, you speak, read, or write easily, smoothly, and clearly with no mistakes.

    e.g. He had emerged from being a hesitant and unsure candidate into a fluent debater.
           他从一个吞吞吐吐、缺乏自信的候选人成长为口若悬河的辩论者。