tranquil
adj.adj. calm, quiet, and peaceful. You use this to describe a place or a person that is free from any disturbance or noise.
adj. free from disturbance or turmoil; peaceful and quiet. Often used to describe environments or a person's state of mind.
The lake was tranquil in the early morning light.
After a stressful week in the city, she found the tranquil atmosphere of the mountain cabin very healing.
The monastery was built in a tranquil valley, far removed from the political upheavals that characterized the rest of the century.
Borrowed from Middle French tranquille, from Latin tranquillus, from trāns- + the root of quiēs (“rest, quiet, peace”), ultimately from *kʷyeh₁- (“to rest”).
Commonly used both attributively before a noun and predicatively after linking verbs like 'remain' or 'seem'.