Difference between Slowly and Quietly

SLOWLY vs QUIETLY: ADVERB

In music
In a slow manner; moderately; not rapidly; not early; not rashly; not readly; tardly.
At a slow pace
Without speed (`slow' is sometimes used informally for `slowly')

With little or no sound
With little or no activity or no agitation (`quiet' is a nonstandard variant for `quietly')
In a restful manner
In a quiet state or manner; without motion; in a state of rest.
Noiselessly; silently; without remark or violent movement; in a manner to attract little or no observation.
In a quiet manner.
With low volume

Slow.
In a slow manner; not quickly or hastily; deliberately; tardily; not rashly or with precipitation.

In a manner to attract little or no observation; without noise: as, he quietly left the room.
Calmly; tranquilly; without agitation or violent emotion; patiently.
Without tumult, alarm, dispute, or disturbance; peaceably: as, to live quietly.
In a quiet state or manner.

Fast, Eventually, Soon, Progressively, Sluggishly, Incrementally, Quietly, Quickly, Rapidly, Steadily, Gradually, Easy, Lento, Tardily, Slow

Delicately, Gently, Blithely, Coolly, Discretely, Cautiously, Happily, Stealthily, Calmly, Unobtrusively, Slowly, Discreetly, Silently, Restfully, Softly

Gently, Fast, Eventually, Soon, Progressively, Sluggishly, Incrementally, Quietly, Quickly, Rapidly, Steadily, Gradually, Easy, Lento, Slow

Discreet, Humbly, Nicely, Comfortably, Secretly, Gently, Blithely, Coolly, Cautiously, Stealthily, Calmly, Slowly, Silently, Restfully, Softly

Breathe in deeply and slowly while you count to five, and then breathe out slowly, counting to five again.
To slowly add hot liquid to eggs while stirring vigorously to slowly bring the mixture up to temperature without curdling the eggs.
Slowly Add Kindling When the tinder bursts into flame, slowly add kindling in small pieces to avoid smothering the fire.
Keeping your knee and leg straight, slowly flex your foot toward you to pull back on the exercise band, and then slowly relax.
Mass of the molecules diffusing: Heavier molecules move more slowly; therefore, they diffuse more slowly.
Slowly we approached the priest; We started talking slowly.
When I was finally able to move him, my horse slowly trudged forward, turned slowly, and attempted to cross.
The coals on top will slowly light those below them and burn down slowly over time.
Raining acid on their and then slowly, ever so slowly, rebuilt.
Our medieval institutions update very, very slowly, craft laws very slowly, elect people very slowly.

He just sat there quietly, and watched TV.
This pump quietly aerates eight gallons of water.
She quietly won and it left everyone speechless.
Move quietly and slip past the enemy patrols.
To describe a verb They are studying quietly.
Prescriptivism resists the latter; descriptivism quietly observes both.
The machines record what is happening in your heart and arteries, first as you sit quietly, and then as you stand quietly.
Tracy, as ever, is quietly impressive, more quietly than in later career and, compared to the older, more affected actor, more natural at thirty.
Would fail she quietly asked me to leave the room quietly clause and to tell how an action takes.
Our principal modeled walking in and sitting quietly, applauding appropriately, and exiting quietly.