English Thesaurus

Synonyms of 'nonchalant'

(adjective) 
Definition
casually unconcerned or indifferent
Denis tried unsuccessfully to look nonchalant and uninterested.
Synonyms
indifferent
People have become indifferent to the suffering of others.
,
cool
He was marvellously cool, smiling as if nothing had happened.
,
calm
Try to keep calm and just tell me what happened.
,
casual
an easy-going young man with a casual approach to life
,
detached
The piece is written in a detached, precise style.
,
careless
Office workers are notoriously careless about their passwords.
,
laid-back (informal)
, ,
unconcerned
Paul was unconcerned about what he had done.
,
apathetic
Many people feel apathetic about the candidates in both parties.
,
dispassionate
We try to be dispassionate about the cases we bring.
,
unfazed (informal)
,
unperturbed
Ruiz seemed totally unperturbed by the events unfolding around him.
,
blasé
his seemingly blasé attitude
,
offhand
Consumers found the attitude of its staff offhand.
,
unemotional
Officials who dealt with Mr Suarez described him as cool, detached, and unemotional.
,
insouciant
He worked with insouciant disregard for convention.
,
imperturbable
He was cool and aloof, and imperturbable.
Opposites

Additional synonyms

in the sense of apathetic
Many people feel apathetic about the candidates in both parties.
in the sense of blasé
his seemingly blasé attitude
Synonyms
in the sense of calm
Definition
not showing or not feeling agitation or excitement
Try to keep calm and just tell me what happened.
Synonyms
unfazed (informal),
unflappable (informal),
keeping your cool,
unexcited,
unexcitable,
as cool as a cucumber,
chilled (informal)

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Source

Thesaurus for nonchalant from the Collins English Thesaurus
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