Ignoramus

имя существительное [латинский язык, множественное число] ignoramuses, ignorami невежда, неуч, профан

Большой англо-русский словарь

Ignoramus

noun (plural -muses; also ignorami) Etymology: Ignoramus, ignorant lawyer in Ignoramus (1615), play by George Ruggle, from Latin, literally, we are ignorant of an utterly ignorant person; dunce

Merriam-Webster's Collegiate Dictionary