Synonyms: still, tranquil, smooth, quiet, placid, unruffled
Definition: (of a body of water) free from disturbance by heavy waves
Usage: a ribbon of sand between the angry sea and the placid bay; the quiet waters of a lagoon; a lake of tranquil blue water reflecting a tranquil blue sky; a smooth channel crossing; scarcely a ripple on the still water; unruffled water
Synonyms: unflurried, unflustered, unperturbed, unruffled
Definition: free from emotional agitation or nervous tension
Usage: the waiters were unflurried and good natured; with contented mind and unruffled spirit- Anthony Trollope
Similar words: composed
Definition: serenely self-possessed and free from agitation especially in times of stress
Usage: the performer seemed completely composed as she stepped onto the stage; I felt calm and more composed than I had in a long time