Adjective
1. free from emotional agitation or nervous tension;
"the waiters were unflurried and good natured""with contented mind and unruffled spirit"- Anthony Trollope2. free from disturbance;
"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"