reticent
adj. 沉默的；有保留的；谨慎的
例句
She was morose, pale, and reticent.
她闷闷不乐，面色苍白，沉默寡言。
《柯林斯英汉双解大词典》
She was shy and reticent.
她羞怯而寡言少语。
《牛津词典》
She is so reticent about her achievements.
她对于自己的成就如此缄默。
