understated

他的演讲风格低调而有力，没有夸张的手势。

His speech was powerful yet ___understated, with no exaggerated gestures.

他在报告中轻描淡写地提到了自己的贡献，尽管这些贡献对项目至关重要。

He ___understated his contributions in the report, though they were crucial to the project.

他轻描淡写地说只是“帮了点小忙”，其实整个项目都是他主导的。

He ___understated his role by calling it 'a little help', though he actually led the whole project.