plac·id /ˈplæsəd/
 (a.)平靜的,沈著的,平穩的


 Plac·id a.  Pleased; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle. “That placid aspect and meek regard.” --Milton. “Sleeping . . . the placid sleep of infancy.”

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 placid
      adj 1: 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" [syn: quiet, still, tranquil, unruffled]
      2: not easily irritated; "an equable temper"; "not everyone
         shared his placid temperament"; "remained placid despite
         the repeated delays" [syn: equable, even-tempered, good-tempered]
      3: without untoward incident or disruption; "a placid
         existence"; "quiet times" [syn: quiet]
      4: taking life easy; "an easygoing man rarely stirred to
         anger"; "an air of placid sufficiency" [syn: easygoing]