1 silently, soundlessly, noiselessly, inaudibly, in silence, softly:
She tiptoed quietly out of the room.
2 in hushed tones, in whispers:
In a corner of the room a young couple were quietly conversing.
3 peacefully, calmly, serenely, peaceably, meekly, mildly:
When the police explained they only wanted him to help in their inquiries, he went with them quietly
4 modestly, humbly, demurely, unpretentiously, unostentatiously, unobtrusively, unassumingly, sedately:
The applicants sat quietly, waiting to be called in for the interview.