unofficial 

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英汉解释

adj. 非官方的；非正式的

反义词

a.   official

参考例句

1. The Union decided to warn all their shop stewards not to take part in unofficial strikes.
工会决定提醒他们所有的商店服务员不要参加非官方的罢工运动。
2. As this millennium dawns, New York City is the most important city in the world, the unofficial capital of planet Earth.
新的千禧年破晓之际，纽约市俨然已成全世界最重要的城市、全〔地〕球非正式的首都。
3. Embarrassed Danes said the text was one of several unofficial papers that had been floated, not a basis for real bargaining.
处境尴尬的丹麦人称该文本只是制定的几个非官方文件之一，不会成为真正谈判的基础。

英英解释

adj.
  1. not having official authority or sanction
  2. not officially established

网络释义

Unofficial
非官方的，非正式的; 非正式; 非正式的; 非官式;
unofficial report
非官方的判例汇编;
Unofficial Strike
非工会支持的罢工;
unofficial translation
非正式译文;
unofficial personnel
编外人员;