really; in fact
真正地；事实上
in truth, she was more than a little unhappy.
实际上，她很不高兴。
to be frank (used especially when making an admission or when expressing an unwelcome or controversial opinion)
坦率地说，说老实话，实话实说（尤用于表示承认某事或表示令人不快或有争议的看法）
I think, if truth be told, we were all a little afraid of him.
说老实话，我认为我们当时都有点儿怕他。
used to emphasize the absolute veracity of a statement
［用于强调所言绝对真实可靠］（本人所述）完全属实，毫无保留，绝对可靠