unofficial

adjective

/ˌʌnəˈfɪʃl/

[usually before noun]

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that does not have permission or approval from somebody in authority未经正式批准的；非官方的；非正式的
- an unofficial agreement/strike未经批准的协议／罢工
- Unofficial estimates put the figure at over two million.非官方的估计数字为 200 万以上。
Extra Examples
- It's one of numerous unofficial Harry Potter websites.这是众多非官方哈利波特网站之一。
- The result for the athlete was an unofficial world best of 2 minutes 27 seconds.该运动员的比赛结果是非官方的世界最好成绩2分27秒。
- Unofficial reports indicated that up to 10 million people had been made homeless.非官方报告显示，多达1000万人无家可归。
- Unofficial sources report that four people were killed in the accident非官方消息称有四人在事故中丧生
that is not part of somebody’s official business非公事的；私事的；私人的
- The former president paid an unofficial visit to China.前总统到中国进行了私人访问。

opposite official