English Thesaurus
(adjective) 
Definition
not showing or not feeling agitation or excitement
Try to keep calm and just tell me what happened.
Synonyms
cool
He was marvellously cool, smiling as if nothing had happened.
, ,
composed
She was standing beside him, very calm and composed.
,
sedate
She took them to visit her sedate, elderly cousins.
, ,
collected
Police say she was cool and collected during her interrogation.
, ,
dispassionate
He spoke in a flat dispassionate tone.
,
unfazed (informal)
,
impassive
He searched the man's impassive face for some indication that he understood.
,
unflappable (informal)
Professional life-savers need to be calm and unflappable.
,
unruffled
Anne had remained unruffled, very cool and controlled.
,
unemotional
Officials who dealt with Mr Suarez described him as cool, detached, and unemotional.
, ,
imperturbable
He was cool and aloof, and imperturbable.
,
equable
He was a man of the most equable temperament.
,
keeping your cool
,
unexcited
,
unexcitable
,
as cool as a cucumber
,
chilled (informal)
Opposites
, , ,
shaken
, , , , ,
aroused
, , , ,
discomposed
(adjective) 
Definition
not showing or not feeling agitation or excitement
The city appears relatively calm today.
Synonyms
peaceful
a peaceful scene
,
quiet
I just want a quiet life.
,
tranquil
The place was tranquil and appealing.
,
undisturbed
the undisturbed waters of the lake
,
untroubled
She remained untroubled by the reports.
,
free from strife
(adjective) 
Definition
(of weather) windless
The normally calm waters of Mururoa lagoon heaved and frothed.
Synonyms
still
He sat very still for several minutes.
,
quiet
He's a nice quiet man.
,
smooth
This was only a brief upset in their smooth lives.
, ,
mild
The area is famous for its mild winters.
,
serene
She looked as calm and serene as always.
, ,
placid
the placid waters of Lake Erie
,
halcyon
The next day dawned sunny with a halcyon blue sky.
,
balmy
a balmy summer's evening
,
restful
a joyous and restful three days
,
windless
,
pacific
a pacific scene
Opposites
(noun) 
Definition
a peaceful state
He felt a sudden sense of calm and contentment.
Synonyms
peacefulness
,
peace
People always felt a sense of peace in her company.
,
serenity
a wonderful feeling of peace and serenity
,
(noun) 
Definition
a peaceful state
the rural calm of Grand Rapids, Michigan
Synonyms
stillness
,
peace
All I want is a bit of peace and quiet.
,
quiet
He wants some peace and quiet.
,
hush
A hush fell over the crowd.
, ,
tranquillity
The hotel is a haven of peace and tranquillity.
,
repose
The atmosphere is one of repose.
, ,
peacefulness
(noun) 
Church leaders have appealed for calm.
Synonyms
Opposites
, ,
wildness
(verb) 
Definition
to make or become calm
She took a deep breath to calm her nerves.
Synonyms
soothe
He would take her in his arms and soothe her.
,
settle
They needed a win to settle their nerves.
, ,
relax
Do something that you know relaxes you.
,
appease
The offer has not appeased separatists.
,
still
Her crying slowly stilled.
The people's voice has been stilled.
,
allay
He did what he could to allay the children's fears.
,
assuage
The meat they'd managed to procure assuaged their hunger.
,
quieten
It took a long time to quieten the paranoia of the West.
Opposites
(verb) 
Definition
to make or become calm
Officials hoped this action would calm the situation.
Synonyms
placate
He smiled, and made a gesture intended to placate me.
, ,
pacify
Is this just something to pacify the critics?
,
mollify
The investigation was undertaken to mollify pressure groups.
Opposites

Additional synonyms

in the sense of allay
Definition
to reduce (fear, doubt, or anger)
He did what he could to allay the children's fears.
in the sense of appease
Definition
to pacify (someone) by yielding to his or her demands
The offer has not appeased separatists.
in the sense of assuage
The meat they'd managed to procure assuaged their hunger.

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Video: pronunciation of 'calm'

Source

Thesaurus for calm from the Collins English Thesaurus
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