inexperienced
  (a.)無經驗的,不熟練的
  In·ex·pe·ri·enced a. Not having experience; unskilled; naive. “Inexperienced youth.”
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  inexperienced
       adj 1: lacking practical experience or training [ant: experienced]
       2: lacking basic knowledge; "how can someone that age be so
          ignorant?"; "inexperienced and new to the real world"
          [syn: ignorant]
       3: lacking experience of life; "a callow youth of seventeen"
          [syn: callow, naive, unsophisticated]