Difference between Quietly and Softly

QUIETLY vs SOFTLY: ADVERB

With little or no sound
With low volume
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 little or no activity or no agitation (`quiet' is a nonstandard variant for `quietly')

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

To be played relatively softly
Used as a direction in music
Slackly; carelessly.
Mildly; tenderly.
Gently; slowly; calmly; quietly; hence, at an easy pace: as, to lay a thing down softly.
In a soft manner.
Soft; easy; gentle; slow.

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

Smoothly, Kindly, Whoa, Shallowly, Quiet, Hush, Sweet, Cautiously, Slowly, Gentle, Tenderly, Lightly, Piano, Quietly, Gently

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

Careful, Gentler, Smoothly, Kindly, Whoa, Quiet, Hush, Sweet, Cautiously, Slowly, Gentle, Tenderly, Piano, Quietly, Gently

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.

They asked softly, reaching out for his hand.
Speak softly and try not to show fear.
After four minutes, speaking softly through the door.
Her tail stopped wagging and she whined softly.
Her words were softly pleasant and carefully enunciated.
She sat and rocked, singing softly to herself.
Over 30 people were killed last month when Kurdish anger over Erdogan's softly-softly strategy against IS spilled onto the streets.
Night, draw near; Lay hands on us and whisper words of cheer So softly, oh, so softly!
Does he have any legal rights if a softly softly approach to the supplying garage is rejected?
Nor do I want to tread softly, softly.