率直 and 謙虚: expressing an opinion and listening humbly
Compare asking for a frank opinion or openly expressing anxiety with listening humbly to others. Frankness does not guarantee factual accuracy, and receptive listening does not establish agreement.
Openly expressing an opinion or anxiety with 率直
率直 (そっちょく) describes frankness in expressing thoughts or feelings. 「改善案について率直な意見を聞かせてください。」 asks for a frank opinion about a proposed improvement, without specifically asking for approval.
「彼女は自分の不安を率直に打ち明けた。」 says that she openly spoke about her anxiety. The word describes how she expressed that anxiety, rather than guaranteeing that its cause or the judgment behind it was factually accurate.
A humble attitude and listening to others with 謙虚
謙虚 (けんきょ) describes a humble attitude. In 「成功しても彼は謙虚な態度を崩さなかった。」, he maintained that attitude even after success; this does not imply that he regarded himself as worthless.
「他人の意見を謙虚に聞く姿勢が大切だ。」 states the importance of listening humbly to other people's opinions. It describes a valued attitude rather than reporting a particular opinion already heard or an agreement reached.
Expressing a view and receiving another view
The request for a frank opinion and the disclosure of anxiety focus on expressing one's own thoughts. Listening humbly focuses on being receptive to someone else's view, so frankness and humility can occur together.
A humble listener can still have an opinion of their own. Likewise, a frankly expressed view is not automatically a correct judgment: distinguish the attitude in expressing or receiving it from its content and accuracy.
Does 「他人の意見を謙虚に聞く姿勢が大切だ。」 report agreement with another person's opinion?
Show the answer and why
No. It says that a humble listening attitude is important, without reporting completed listening or agreement. Listening humbly can also coexist with having an opinion of one's own.

