lacking in knowledge or training; unlearned

an ignorant man.

lacking knowledge or information as to a particular subject or fact

ignorant of quantum physics.

uninformed; unaware.

due to or showing lack of knowledge or training

an ignorant statement.

adjective

aware , competent , educated , intelligent , knowledgeable , literate , talented , wise , instructed , learned , proficient , schooled , trained

adjective

apprenticed , benighted , birdbrained , blind to , cretinous , dense , green * , illiterate , imbecilic , inexperienced , innocent , insensible , in the dark , mindless , misinformed , moronic , naive , nescient , oblivious , obtuse , shallow , thick , unconscious , unconversant , uncultivated , uncultured , uneducated , unenlightened , uninformed , uninitiated , unintellectual , unknowledgeable , unlearned , unlettered , unmindful , unread , unschooled , unsuspecting , untaught , untrained , unwitting , witlessnotes:stupid refers to lack of ability while ignorant refers to lack of knowledge , uninstructed , backward , primitive , unacquainted , unaware , unfamiliar , unknowing , callow , charlatanic , green , inerudite unenlightened , quackish , stupid , uniformed , unskilled , untutored , young