[adj] 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"
[adj] taking life easy; "an easygoing man rarely stirred to anger"; "an air of placid sufficiency"
[adj] without untoward incident or disruption; "a placid existence"; "quiet times"
[adj] not easily irritated; "an equable temper"; "not everyone shared his placid temperament"; "remained placid despite the repeated delays"
calm, content(p), contented, easygoing, equable, even-tempered, good-natured, good-tempered, quiet, still, tranquil, uneventful, unruffled