1. most calm, peaceful, and untroubled; superlative form of serene
Usage: superlative form

Examples

• The lake was at its serenest in the early morning hours.
• She maintained the serenest expression despite the chaos around her.
• This was the serenest moment of his entire vacation.
• The garden looked serenest after the gentle rain.
• Her serenest smile put everyone at ease.
• The serenest part of the day was just before sunset.