unruffled
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(s) free from emotional agitation or nervous tension
- the waiters were unflurried and good natured
- "with contented mind and unruffled spirit"- Anthony Trollope
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(s) (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