reticent

形容词 reticent:

1. temperamentally disinclined to talk
   同义词：untalkative
2. cool and formal in manner
   同义词：reserved, restrained, unemotional
3. reluctant to draw attention to yourself
   同义词：self-effacing, retiring

1. He seems unduly reticent on the subject of his past.
   他似乎对他过去的事情讳莫如深。

ret.i.cent

adj.（形容词）
Inclined to keep one`s thoughts, feelings, and personal affairs to oneself.See Synonyms at silent
沉默寡言的：倾向于保留某人的想法、感情及个人事务的参见 silent
Restrained or reserved in style.
有节制的：在风格上受限的或保留的
Reluctant; unwilling.
不情愿的；勉强的

来源：
Latin reticôns reticent- [present participle of] reticôre [to keep silent]
拉丁语 reticôns reticent- [] reticôre的现在分词 [保持沉默]
re- [re-]
re- [表示.再.]
tacôre [to be silent]
tacôre [沉默]

【引伸】
ret.icently
adv.（副词）