形容词

1. 平和的；温和的
A placid person or animal is calm and does not easily become excited, angry, or upset.

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: quietstilltranquilsmoothunruffled

2. not easily irritated

e.g. an equable temper
not everyone shared his placid temperament
remained placid despite the repeated delays

Synonym: equableeven-temperedgood-tempered