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Adjective: unpracticed  ,ún'prak-tist
Usage: N. Amer (elsewhere: unpractised)
  1. Not having had extensive practice or experience
    "It is hard to gain confidence in the perfection of wisdom if one is unpracticed";
    - unpractised [Brit, Cdn], unversed

See also: green [informal], inexperienced, inexperient [non-standard]