cheer·ful /ˈʧɪrfəl/
  (a.)快活的,高興的,興高采烈
  Cheer·ful a. Having or showing good spirits or joy; cheering; cheery; contented; happy; joyful; lively; animated; willing.
     To entertain a cheerful disposition.   --Shak.
  The cheerful birds of sundry kind
  Do chant sweet music.   --Spenser.
     A cheerful confidence in the mercy of God.   --Macaulay.
     This general applause and cheerful shout.   --Shak.
  Syn: -- Lively; animated; gay; joyful; lightsome; gleeful; blithe; airy; sprightly; jocund; jolly; joyous; vivacious; buoyant; sunny; happy; hopeful.
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  cheerful
       adj 1: being full of or promoting cheer; having or showing good
              spirits; "her cheerful nature"; "a cheerful greeting";
              "a cheerful room"; "as cheerful as anyone confined to
              a hospital bed could be" [ant: cheerless]
       2: pleasantly (even unrealistically) optimistic [syn: pollyannaish,
           upbeat]