His academic record was unimpressive.

他的学业成绩平平。

Dewey was an unimpressive, rather dull lecturer.

杜威是个没特色的，有些无聊的讲师。

Rainey was an unimpressive, rather dull lecturer .

雷尼是个平庸而且相当乏味的老师。

He had an unimpressive career with virtually no team success.

事实上在团队成功方面，他的职业生涯并不怎么引人注目。

Call quality is great, but streaming video quality is unimpressive.

通话质量是伟大的，但流媒体视频质量没有什么大不了。