tranquil
1. [ adjective ] characterized by absence of emotional agitation
Synonyms: calm serene
Examples:

"calm acceptance of the inevitable" "remained serene in the midst of turbulence" "a serene expression on her face" "she became more tranquil" "tranquil life in the country"

Related terms: peaceful
2. [ adjective ] free from disturbance
Synonyms: still placid quiet unruffled
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:   tranquilly
  tranquilize
  tranquility
  trinuclear
  Transue
  trinucleate
  Trinkle
  transude