serene
US /səˈriːn/
UK /səˈriːn/

1.
tenang, damai, tentram
calm, peaceful, and untroubled; tranquil
:
•
The lake was serene in the early morning light.
Danau itu tenang dalam cahaya pagi hari.
•
She had a serene expression on her face.
Dia memiliki ekspresi tenang di wajahnya.