1. unflurried, unflustered, unperturbed, unruffled

free from emotional agitation or nervous tension

Example Sentences:
'the waiters were unflurried and good natured'
'with contented mind and unruffled spirit'

Synonyms

• unflurried
• unflustered
• unperturbed

2. placid, quiet, smooth, still, tranquil, unruffled

(of a body of water) free from disturbance by heavy waves

Example Sentences:
'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

• placid
• quiet
• smooth
• still
• tranquil