be frank and outspoken 心直口快

“心直口快”，汉语成语，意思是“性情直爽，有话就说”。可以翻译为“be frank and outspoken，be straightforward”等。

例句：

他心直口快，说话总是不太顾忌。

He had a quick tongue and always said what he thought without much deliberation.