/'neɪmlɪs; `nemlɪs/
adj
1 (a) [esp attrib 尤作定语] having no name or no known name; anonymous 无名的; 不知名的; 匿名的
*a nameless grave 无名墓
* a nameless 13th century poet 13世纪的一个不知名的诗人
* the nameless thousands who built the pyramids 建筑金字塔的成千上万不知姓名的人.
(b) not mentioned by name 未提及姓名的; 不道出姓名的
*He had received information from a nameless source in the government. 他从政府中一未透露姓名者那里得到了消息.
* a well-known public figure, who shall be/remain nameless, ie whose name I will not mention 一位知名人士, 姑隐其姓名.
2 [esp attrib 尤作定语]
(a) (esp of emotions) not easy to describe （尤指情感）不可名状的, 难以形容的
*a nameless longing, fear, etc 不可名状的渴望、恐惧等.
(b) too terrible to describe; unmentionable （糟糕得）难以形容的; 难以启齿的
*the nameless horrors of the prison camp 战俘营中难以形容的恐怖.

adj
who shall remain nameless
spoken used when you want to say that someone has done something wrong but without mentioning their name, especially to criticize them in a friendly way
　A certain person, who shall remain nameless, forgot to lock the front door.
[only before noun]
a nameless person is someone whose name is not known
　the work of some nameless 13th century writer
[only before noun]
a nameless thing does not have a name
　He lay still in his nameless grave.
[only before noun]literary
nameless emotions are very strong and difficult to describe in words
　He managed to calm her nameless fears.
[only before noun]literary
too terrible to name or describe
　nameless horrors