侃侃而谈 (kǎn kǎn ér tán): To speak frankly with assurance — Meaning & Stroke Order

At family gatherings, he can always speak frankly and confidently on various topics.

This expert spoke frankly and assuredly about cutting-edge technology at the academic forum.

How can you still speak so frankly and confidently in such a tense atmosphere?

He cannot speak frankly and confidently on every topic; sometimes he remains silent.