a.

1. 匿名的；姓氏不明的
   We received an anonymous letter.

   我們收到一封匿名信。

2. 出自無名氏之手的；來源不明的
   An anonymous author wrote this book.

   這本書出自無名氏之手。

3. 無特色的，無個性特徵的
   the anonymous buildings

   外觀千篇一律的樓房

adj.

1. not identified by name; of unknown identity:
   an anonymous phone call.
2. having no individual or unusual features.