Know nothing

stupid person, one who is very dumb

The Know Nothing movement was a nativist American political movement of the 1850s. It was empowered by popular fears that the country was being overwhelmed by Irish Catholic immigrants, who were often regarded as hostile to American values and controlled by the Pope in Rome. Mainly active from 1854–56, it strove to curb immigration and naturalization, though its efforts met with little success. There were few prominent leaders, and the largely middle-class and Protestant membership fragmented over the issue of slavery, most often joining the Republican Party by the time of the 1860 presidential election.
See more at Wikipedia.org...

Noun
1. an ignorant person
(synonym) ignoramus, uneducated person
(hypernym) unskilled person
(hyponym) aliterate, aliterate person

(n.)
A member of a secret political organization in the United States, the chief objects of which were the proscription of foreigners by the repeal of the naturalization laws, and the exclusive choice of native Americans for office.
  

n.
جاہل آدمي, جاہل مطلق