Serene
/səˈɹiːn/
noun
Serenity; clearness; calmness.
Evening air; night chill.
verb
To make serene.
adjective
Peaceful, calm, unruffled.
“She looked at her students with joviality and a serene mentality.”
Without worry or anxiety; unaffected by disturbance.
Fair and unclouded (as of the sky); clear; unobscured.