形容词

1. 平静的;安静的;宁静的
Something that is tranquil is calm and peaceful.

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

e.g. 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: placidquietstillsmoothunruffled

2. not agitated
without losing self-possession

e.g. 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: calmunagitatedserene