an unwillingness to do something or talk about something, for example because you are nervous or being careful

His reticence about his past made them very suspicious. 他对自己的过去讳莫如深，使他们非常怀疑。

I think my dad had a certain reticence about showing love as he was afraid that people would leave if he did. 我觉得父亲不愿意表达爱意，因为他害怕如果他表达了，人们会离开他。