unruffled

Adjective (2)

1. free from emotional agitation or nervous tension“the waiters were unflurried and good natured”“with contented mind and unruffled spirit — Anthony Trollope”Synonyms: unflurriedunflusteredunperturbed
2. (of a body of water) free from disturbance by heavy waves“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: placidquietstilltranquilsmooth