calm
adj
1 balmy, halcyon, mild, pacific, peaceful, placid, quiet, restful, serene, smooth, still, tranquil, windless
2 as cool as a cucumber, collected, composed, cool, dispassionate, equable, impassive, imperturbable, keeping one's cool, relaxed, sedate, self-possessed, undisturbed, unemotional, unexcitable, unexcited, unfazed (informal) unflappable (informal) unmoved, unruffled
vb
3 hush, mollify, placate, quieten, relax, soothe
n
4 calmness, hush, peace, peacefulness, quiet, repose, serenity, stillness
Antonyms
, adj agitated, aroused, discomposed, disturbed, emotional, excited, fierce, frantic, heated, perturbed, rough, shaken, stormy, troubled, wild, worried
vb aggravate, agitate, arouse, disturb, excite, irritate, stir
n agitation, disturbance, wildness