adverbs
with low volume
"speak softly but carry a big stick"; "she spoke quietly to the child"; "the radio was playing softly"
with little or no sound
"the class was listening quietly and intently"; "she was crying quietly"
with little or no activity or no agitation (`quiet' is a nonstandard variant for `quietly')
"her hands rested quietly in her lap"; "the rock star was quietly led out the back door"; "sit here as quiet as you can"
in a restful manner
"the streets are restfully sunny and still for the town is at mass"