unruffled
1. [ adjective ] free from emotional agitation or nervous tension
Synonyms: unflustered unperturbed unflurried
Examples:

"the waiters were unflurried and good natured" "with contented mind and unruffled spirit"- Anthony Trollope

Related terms: composed
2. [ adjective ] free from disturbance
Synonyms: still placid tranquil quiet
Examples:

"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"

Related terms: calm
Similar spelling:   unrifled
  unreflected