English Thesaurus

Synonyms of 'imperturbable'

(adjective) 
Definition
not easily upset
He was cool and aloof, and imperturbable.
Synonyms
calm
Try to keep calm and just tell me what happened.
,
cool
He was marvellously cool, smiling as if nothing had happened.
,
collected
Police say she was cool and collected during her interrogation.
,
composed
She was standing beside him, very calm and composed.
, ,
serene
She looked as calm and serene as always.
,
tranquil
She lived a tranquil life.
,
sedate
She took them to visit her sedate, elderly cousins.
,
undisturbed
Victoria was strangely undisturbed by this news.
, ,
stoic
,
stoical
He had been stoical at their parting.
,
unfazed (informal)
,
unflappable (informal)
Professional life-savers need to be calm and unflappable.
,
unruffled
Anne had remained unruffled, very cool and controlled.
,
self-possessed
She is the most articulate and self-possessed member of her family.
,
nerveless
He's a nerveless player - that's how he won the Open.
,
unexcitable
,
equanimous
Opposites
, , , ,
ruffled
, ,
jittery (informal)
, ,

Additional synonyms

in the sense of collected
Definition
brought together into one book or set of books
Police say she was cool and collected during her interrogation.
Synonyms
together (slang),
self-controlled,
unfazed (informal),
keeping your cool,
unperturbable,
as cool as a cucumber,
chilled (informal)
in the sense of composed
Definition
(of people) in control of their feelings
She was standing beside him, very calm and composed.
Synonyms
together (slang),
at ease,
laid-back (informal),
self-controlled,
unfazed (informal),
unworried,
keeping your cool,
as cool as a cucumber,
chilled (informal),
grounded
in the sense of cool
Definition
calm and unemotional
He was marvellously cool, smiling as if nothing had happened.
Synonyms
together (slang),
laid-back (informal),
self-controlled,
unfazed (informal),
unexcited,
QL,
chilled (informal)

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Source

Thesaurus for imperturbable from the Collins English Thesaurus
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