slower

Taking a long time to move or go a short distance, or to perform an action; not quick in motion; proceeding at a low speed.

“a slow train;  a slow computer”

Not happening in a short time; spread over a comparatively long time.

Of reduced intellectual capacity; not quick to comprehend.

Not hasty; not tending to hurry; acting with deliberation or caution.

(of a clock or the like) Behind in time; indicating a time earlier than the true time.

“That clock is slow.”

Lacking spirit; deficient in liveliness or briskness.

(of a period of time) Not busy; lacking activity.

“I'm just sitting here with a desk of cards, enjoying a slow afternoon.”

Slowly.

“That clock is running slow.”

That which slows.