Source : Webster's Revised Unabridged Dictionary (1913)

Unruffled \Un*ruf"fled\, a. [Pref. un- not + ruffled.]
   Not ruffled or agitated; smooth; calm; tranquil; quiet.

         Calm and unruffled as a summer's sea.    --Addison.

Source : WordNet®

unruffled
     adj 1: free from emotional agitation or nervous tension; "the
            waiters were unflurried and good natured"; "with
            contented mind and unruffled spirit"- Anthony Trollope
            [syn: {unflurried}, {unflustered}, {unperturbed}]
     2: 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" [syn: {placid}, {quiet},
         {still}, {tranquil}]