In a slow manner; at a slow rate or speed; gradually; after a relatively long period of time.

In a slow manner; at a slow pace or speed; slowly.

A transcription error in N.E.D. for silently in the following quot..

With the slow motion characteristic of a snail; tardily, sluggishly.

in a loitering manner; in early use, †like a vagabond.

Slowly; tediously. Now rare.

As if through or in ooze or mud. Also figurative: unctuously.

in a leaden manner; without elasticity or spring; after the manner, or with the effect of a leaden weight.

figurative. With the slowness of a glacier.