"unruffled" in the adjective sense
1. unflurried, unflustered, unperturbed, unruffled
free from emotional agitation or nervous tension
"the waiters were unflurried and good natured"
"with contented mind and unruffled spirit"- Anthony Trollope
2. placid, quiet, still, tranquil, smooth, unruffled
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"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License