without rough motion; still or nearly still

a calm sea.

not windy or stormy

a calm day.

free from excitement or passion; tranquil

a calm face; a calm manner.

freedom from motion or disturbance; stillness.

Meteorology . wind speed of less than 1 mph (0.447 m/sec).

freedom from agitation, excitement, or passion; tranquillity; serenity

She faced the possibility of death with complete calm.

to make calm

He calmed the excited dog.

to become calm (usually fol. by down ).

adjective

excited , fierce , frenzied , rough , stormy , turbulent , violent , wild , agitated , angry , excitable , furious , mad , passionate , roused , ruffled , worried , boisterous , discomposed , perturbed

noun

agitation , anger , madness , restlessness , storminess , terror , turbulence , violence

verb

agitate , anger , disquiet , distract , excite , inflame , irritate , outrage , rouse , ruffle , worry

adjective

at a standstill , at peace , bland , bucolic , cool , halcyon , harmonious , hushed , inactive , in order , low-key , mild , motionless , pacific , pastoral , placid , quiescent , reposeful , reposing , restful , rural , serene , slow , smooth , soothing , still , stormless , tranquil , undisturbed , unruffled , waveless , windless , aloof , amiable , amicable , civil , collected , cool as cucumber , cool-headed , detached , disinterested , dispassionate , equable , gentle , impassive , imperturbable , inscrutable , kind , laid-back * , levelheaded , listless , moderate , neutral , patient , pleased , poised , relaxed , satisfied , sedate , self-possessed , temperate , unconcerned , unemotional , unexcitable , unexcited , unflappable , unimpressed , unmoved , untroubled , peaceful , quiet , stilly , composed , even , even-tempered , nonchalant , possessed , anodynic , apathetic , assuasive , calmant , calmative , equanimous , fatalistic , grave , hermetic , hesychastic , impartial , impervious , indifferent , insensate , insouciant , lackadaisical , nepenthean , oasitic , philosophical , phlegmatic , placative , placatory , pococurante , sedative , sober , staid , stoic , stolid , subdued , tranquilizing , unagitated

noun

calmness , dispassion , doldrums , hush , impassivity , imperturbation , lull , patience , peace , peacefulness , peace of mind , placidity , quiet , repose , rest , restraint , serenity , silence , stillness , stoicism , tranquility , placidness , quietness , tranquillity , untroubledness , quietude , apathy , assuagement , ataraxia , composure , detente , equability , equanimity , forbearance , insouciance , lassitude , nepenthe , nonchalance , passivity , phlegm , placation , pococurantism , propitiation , sang-froid , sedation , sedative , solemnity , tranquilization , tranquilizer

verb

allay , alleviate , appease , assuage , balm , becalm , compose , cool , cool it , cool out , hush , lay back , lull , mitigate , mollify , pacify , placate , quiet , quieten , relax , relieve , sedate , settle , simmer down , soft-pedal * , soothe , steady , still , stroke , take it easy , take the edge off , tranquilize , conciliate , dulcify , gentle , propitiate , soften , sweeten , abate , charm , collect , collected , complacence , composed , console , cool-headed , defuse , dispassionate , dispel , docile , ease , easy , easygoing , equable , fair , halcyon , harmonious , impassive , levelheaded , lowkey , mild , moderate , nonchalant , passive , pastoral , patient , peace , peaceful , placid , quell , quiesce , quiescent , reconcile , rest , restful , restrain , serene , silence , simmer , slacken , smooth , sober , stoic , subdued , subside , temperate , tranquil , tranquillize , unconfused , undisturbed , unexcited , unmoved , unruffled