プログレッシブ和英中辞典(第4版)の解説
そっちょく【率直】
率直な frank; candid; open; straightforward（▼frankは遠慮のない，candidは正直にありのままな，openは隠し立てをしない，straightforwardは遠回しやあいまいさがないこと）
態度が率直な人だ
His manner is frank and open.／He is straightforward in manner.
率直に言うと君の主張は全然説得力がない
「To put it bluntly [Frankly speaking], your argument is not at all convincing.
率直に話し合いましょう
Let's talk frankly.／Let's be honest with each other.
率直に言わせてもらうが君はまず彼に謝罪すべきだと思う
I'll be quite candid with you. I think you should first of all apologize to him.