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Definitions

cool as a cucumber

ADJECTIVE
placid
Synonyms
STRONGEST
easygoing even-tempered gentle peaceful quiet serene tranquil
WEAK
collected composed cool detached equable even halcyon hushed imperturbable irenic poised restful self-possessed still
Antonyms
STRONGEST
agitated clamorous disturbed excited loud noisy troubled turbulent violent wild
ADJECTIVE
serene
Synonyms
STRONGEST
comfortable composed cool easygoing laid-back peaceful placid poised quiet sedate smooth tranquil unflappable
WEAK
at peace clear collected content dispassionate easy fair halcyon imperturbable limpid patient pellucid phlegmatic quiescent reconciled resting satisfied self-possessed still stoical unruffled untroubled
Antonyms
STRONGEST
agitated annoyed clamorous excited loud nervous noisy poor turbulent uncool upset violent worried
WEAK
disturbed troubled

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"She's really tough to play, she has a massive serve, big groundstrokes, cool as a cucumber, you get nothing out of her," said Pegula.

From Barron's • Jan. 28, 2026

They found the faulty part, did the maintenance and we are now cool as a cucumber.

From Seattle Times • Aug. 11, 2023

It's only her second-ever stage appearance but she's cool as a cucumber, marching in step with the professionals as 60,000 people look on.

From BBC • May 29, 2023

It was literally part of my job to have kind of a persona which was sort of unflappable and, you know, kind of cool as a cucumber.

From Los Angeles Times • Jun. 7, 2022

Shorty just smiled, cool as a cucumber in spite of a split lip.

From "The Milagro Beanfield War" by John Nichols