slow and awkward because of being very heavy or large

He had a slow and ponderous manner. 他的举止缓慢笨拙。

If a book, speech, or style of writing or speaking is ponderous, it is boring because it is too slow, long, or serious.

The ponderous reporting style makes the evening news dull viewing. 沉闷的播音风格使晚间新闻看起来很乏味。