Word: serenest
Peaceful, calm, unruffled. Example: 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.
Used as part of certain titles, originally to indicate sovereignty or independence. Example: Her Serene Highness
You can find a list of possible crossword clues for SERENEST below.