I could hear my father bumbling about downstairs.

我听见父亲在楼下跌跌撞撞地走着。

"The old lady kept bumbling on about something, but nobody could understand her."

"老太太结结巴巴地说个不停,可谁也不明白她说些什么。"

He kept bumbling on about something.

他结结巴巴地说个不停。

All bumbling conjurers, clumsy squires, no-talent bards, and cowardly thieves in the land will be pre-emotively put to death.

所有无能师，笨拙随从，没有天分吟游诗以及胆小盗贼都将会事先被处死。