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serene

/səˈriːn//səˈriːn/·adjective
calm, peaceful, and completely untroubled
Fig. 1 — A low sun lays a long ribbon of light across a lake so flat it holds the whole sky upside down, and I find I've gone quiet just looking at it.
01Definition

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.

02In use
  • iThe serene surface of the lake barely rippled, even as the wind began to abate over the far hills.
  • iiYears of practice gave her a serene focus that no amount of pressure could erode.
  • iiiHe stayed serene while everyone around him panicked about the looming deadline.
03Collocations
  • a serene smile
  • serene confidence
  • a serene landscape
  • remarkably serene
  • serene and unhurried

Family serenity (noun) · serenely (adverb)

04Relations

=calm, tranquil, peaceful, placid, untroubled

≠agitated, turbulent, frantic

06TOEFL & 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.

07Asked
What does serene mean?
Deeply, settledly calm — a peace that holds even when trouble passes close. It is stronger than quiet or calm: those describe an absence of noise or motion, while serene describes a composure that outside disturbance cannot break. From Latin serenus, 'clear and cloudless', said of fair weather. The scene above is the word itself: a lake so still it can carry a gliding swan without breaking.
What is the difference between serene, calm and tranquil?
Calm is the plainest and the most fragile — a calm that a single shock can shatter. Serene is inner and durable: a composure that holds under pressure, which is why we speak of serene confidence. Tranquil leans outward, describing a peaceful setting more than a peaceful mind — a tranquil valley. Calm can be momentary; serene is a standing quality.
What does serenity mean?
The noun of serene: a state of calm that does not depend on calm surroundings — inner peace that holds while things go wrong outside. That independence is the whole point. Where 'relaxation' needs the conditions to be right, serenity is the composure people cultivate precisely so that chaos cannot reach it, which is why it reads as an achievement rather than a mood.
Is 'serene' related to 'serious'?
No — they only look alike. Serene comes from Latin serenus, 'clear sky'; serious from serius, 'weighty, grave'. A serene person is untroubled; a serious one is grave or earnest — nearly opposite moods. The shared 'ser-' is coincidence, not kinship, so do not let the resemblance pull the meanings together in a reading passage.