unskilled

not having or showing or requiring special skill or proficiency; "unskilled in the art of rhetoric"; "an enthusiastic but unskillful mountain climber"; "unskilled labor"; "workers in unskilled occupations are finding fewer and fewer job opportunities"; "unskilled workmanship"

lacking professional skill or expertise; "a very amateurish job"; "inexpert but conscientious efforts"; "an unskilled painting"

not doing a good job; "incompetent at chess"