For a peaceful atmosphere:
* Serene: Suggests a calm, tranquil environment.
* Tranquil: Similar to serene, but with an emphasis on stillness.
* Peaceful: Implies a lack of disturbance or conflict.
* Still: Focuses on the absence of movement or sound.
For a lack of noise:
* Silent: Emphasizes complete absence of sound.
* Hushed: Suggests a low level of sound, often creating a sense of mystery.
* Soundless: A stronger version of silent, implying complete absence of sound.
* Muffled: Implies sound is present but dampened or obscured.
For a person's demeanor:
* Reserved: Implies a tendency to be quiet and uncommunicative.
* Introspective: Suggests someone who is thoughtful and quiet.
* Subdued: Implies a quiet and restrained manner.
* Discreet: Highlights someone who is careful about what they say or do.
For a specific type of silence:
* Eerie: Implies a sense of unease or foreboding.
* Ominous: Suggests something threatening or dangerous is about to happen.
* Solemn: Implies seriousness and respect.
For a physical environment:
* Secluded: Suggests a place that is hidden or isolated.
* Remote: Similar to secluded, but emphasizes distance.
* Solitary: Suggests a place where there is no one else.
For a specific type of sound:
* Whispering: A very soft and gentle sound.
* Rustling: A soft, gentle sound of movement, often leaves or paper.
* Humming: A low, continuous sound.
Ultimately, the best word for "quiet" depends on the specific context you are writing about. Consider the specific feeling or meaning you want to convey and choose the word that best fits your needs.