calm

[1]	tranquilize , tranquillize , tranquillise
[2]	steady , becalm
[3]	calm down , quiet , cool off , chill out , quieten , still , simmer down , soothe , settle down , cool it , hush , lull , pacify , mollify , appease , placate , become/make quiet/pacified/less agitated , (Colloq) cool off/down
[4]	sedate , tranquilize , tranquillize , tranquillise

[1]	quiet , stillness , tranquillity , serenity , hush , peace , peacefulness
[2]	calmness , calm air , composure , placidity , placidness , peace , repose , sang-froid , coolness , self-control , equanimity , self-possession

adj.

[1]	quiet , still , tranquil , serene , peaceful , balmy , halcyon , mild , undisturbed , unagitated , placid , pacific , motionless , smooth , even , windless
[2]	composed , cool , cool-headed , self-controlled , impassive , dispassionate , unmoved , unruffled , serene , tranquil , sedate , staid , stoical , (Colloq) together