an ignorant or totally uninformed person; ignoramus.

an agnostic.

( initial capital letters ) U.S. History . a member of a political party (American party or Know-Nothing party) prominent from 1853 to 1856, whose aim was to keep control of the government in the hands of native-born citizens

so called because members originally professed ignorance of the party's activities.

a person whose anti-intellectualism, xenophobia, and other political attitudes recall the Know-Nothings.

grossly ignorant; totally uninformed.

agnostic.

( initial capital letters ) of or pertaining to the Know-Nothings.

of or pertaining to a political know-nothing.