Definition
Serene is a deep, settled calm — the stillness of clear skies and unruffled water, or of a mind that nothing seems to disturb. Stronger and more poised than merely 'quiet', it suggests a peace that holds even when trouble passes close by. The word comes from the Latin serenus, used of fair, cloudless weather, and it keeps that bright, open quality: a serene lake mirrors the sky exactly because nothing is stirring it.
Examples
Collocations
a serene smile·serene confidence·a serene landscape·remarkably serene·serene and unhurried
Synonyms
calm·tranquil·peaceful·placid·untroubled
Antonyms
agitated·turbulent·frantic
Word family
serenity (noun)·serenely (adverb)
In TOEFL & IELTS
A high-value descriptive adjective for IELTS Speaking Part 2 (describe a calm place) and for descriptive Writing, where it outclasses 'nice' or 'quiet'. It pairs with landscapes and with temperament ('serene confidence'). Promote the noun serenity. Note it is unrelated to serious despite the similar look.