I looked a bit stiff while they were so lively.

他们都那样活泼，显得我太板了。

《新英汉大辞典》

The boy is so lively.

这个男孩真活泼。

youdao

With a little old driver, so lively and quick.

上面坐着一个小小的老车夫。

youdao

So lively,you don't notice the truck that's about to hit you.

但没有注意到卡车撞来。

耶鲁公开课 - 死亡课程节选

The smell was so strong, the bubbling so lively, a pity the stuff had no use.

NPR: Excerpt: 'Natives and Exotics'

He was so lively, he was full of boundless energy and always smiling.

BBC: Wales

Junie, living in a world somewhat divorced from reality, fluttery, vague, but oh so lively, lovely, kind, and sunny.

FORBES: My Aunt, Olive June Black, An Ohio Original -- In Memoriam