At a slow pace.
"He carefully and slowly lifted the heavy box so it wouldn't tip over."
In plain English: Slowly means doing something at a low speed or taking your time to move or act.
"She walked slowly across the park to enjoy the evening breeze."
Slowly comes from the Old English word slāwlīċe, which originally meant "slowly" or "sluggishly." The term entered Middle English with a similar spelling and meaning before becoming standard in modern usage.