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WordNet (r) 3.0 (2006) (WordNet)

tranquil
adj 1: (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" [synonym: {placid}, {quiet},
{still}, {tranquil}, {smooth}, {unruffled}]
2: not agitated; without losing self-possession; "spoke in a
calm voice"; "remained calm throughout the uproar"; "he
remained serene in the midst of turbulence"; "a serene
expression on her face"; "she became more tranquil";
"tranquil life in the country" [synonym: {calm}, {unagitated},
{serene}, {tranquil}]