Adjective: unruffled ,ún'rú-fuld
- Free from emotional agitation or nervous tension
"with contented mind and unruffled spirit";
- unflurried, unflustered, unperturbed, untroubled, unfazed [informal], nonplussed [N. Amer, informal]
- (of a body of water) free from disturbance by heavy waves
"unruffled water";
- placid, quiet, still, tranquil, smooth