unskillful

1. Unskilled; inexpert.
2. Obsolete. Ignorant.

adjective

1. Lacking the qualities, as efficiency or skill, required to produce desired results: inapt, incapable, incompetent, inefficient, inept, inexpert, unskilled, unworkmanlike. See ability/inability.
2. Lacking the required professional skill: amateurish, dilettante, dilettantish, nonprofessional, unprofessional, unskilled. See ability/inability.
3. Clumsily lacking in the ability to do or perform: awkward, bumbling, clumsy, gauche, heavy-handed, inept, maladroit. See ability/inability.

The adjective has one meaning:

Meaning #1: poorly done
  Synonyms: botchy, butcherly