(a.) In the style of an amateur; superficial or defective like the work of an amateur.

amateur clumsy crude dabbling defective deficient dilettante dilettantish faulty flawed green half-assed half-baked half-cocked immature jackleg raw sciolistic semiskilled shallow smattering sophomoric superficial unaccomplished unbusinesslike uncoached unendowed unfinished ungifted uninitiated unpolished unprepared unprimed unprofessional unschooled unskilled untalented untaught untrained untutored