adjective

lacking knowledge or awareness in general; uneducated or unsophisticated.

he was told constantly that he was ignorant and stupid

uneducated,unknowledgeable,untaught,unschooled,untutored,untrained,illiterate,unlettered,unlearned,unread,uninformed,unenlightened,unscholarly,unqualified,benighted,backward,inexperienced,unworldly,unsophisticated,unintelligent,stupid,simple,empty-headed,mindless,pig-ignorant,thick,airheaded,dense,dumb,dim,dopey,wet behind the ears,slow on the uptake,dead from the neck up,a brick short of a load,dozy,divvy,daft,not the full shilling,(as) thick as two short planks,glaikit,chowderheaded,dumb-ass,dotish,dof,hebete