
Latin, meaning: to be ignorant, be unaware, not know, be unkowing.
Found on
http://archives.nd.edu/nnn.htm

`Nescio`, Latin for `I don`t know`, was the pseudonym of the Dutch writer Jan Hendrik Frederik Grönloh, who was born on June 22, 1882 in Amsterdam and died on July 25, 1961 in Hilversum, also in the Netherlands. Grönloh was a businessman by profession, but as Nescio he is mainly remembered for the three novellas De uitvreter (The Moocher), ...
Found on
http://en.wikipedia.org/wiki/Nescio

to be ignorant, be unaware, not know, be unknowing.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.