反义词是as slowly as，中文意思是慢如，和……一样慢

He walked as slowly as a snail.他走路像蜗牛一般缓慢。

Breathe out as slowly as possible.呼气也尽可能的缓慢进行。！

He doesn't walk as slowly as you.他走路不像你那样慢。

He worked as slowly as he dared.