1. He broke out of his normal reticence and told me the whole story.
    他打破了平时一贯沉默寡言的习惯，把事情原原本本都告诉了我。

1. 沉默寡言：Hyperabstraction过度抽象 | Reticence沉默寡言 | Garrulousness多嘴多舌

2. 沉默寡言, 缄默; 节制; 保留 (名)：rethink 再想; 重新考虑 (动) | reticence 沉默寡言, 缄默; 节制; 保留 (名) | reticent 无言的; 谨慎的; 沉默的; 抑制的 (形)

1. the trait of being uncommunicative
    not volunteering anything more than necessary

    Synonym: reservetaciturnity