Unprofessional

Adjective

 * 1) unbecoming of a professional; hence inappropriate in the workplace
 * unprofessional behavior

Thesaurus
amateur, amateurish, everyday, improper, incompetent, inefficient, inexperienced, inexpert, inferior, lax, lay, low-quality, negligent, ordinary, plain English, poor, second-rate, semiskilled, shoddy, sloppy, unaccomplished, unbecoming, unbefitting, unbusinesslike, uncoached, understandable, undignified, unendowed, unethical, unfinished, unfitting, ungifted, uninitiated, unpolished, unprepared, unprimed, unprincipled, unscholarly, unschooled, unseemly, unskilled, untalented, untaught, untrained, untutored, unworthy