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Synonyms for Unskilled (same or very similar meaning)

WordNet sense 1 (not carefully or expertly made):

WordNet sense 2 (showing lack of skill or aptitude):
bungling, clumsy, incompetent, fumbling

WordNet sense 3 (lacking professional skill or expertise):
amateur, amateurish, inexpert

WordNet sense 4 (not characteristic of or befitting a profession or one engaged in a profession):

WordNet sense 5 (having undesirable or negative qualities):

From the ODE community, based on WordNetadd/edit