Crossword clues for the word: KNOWNOTHING The word KNOWNOTHING has appeared as an answer to at least 4 crossword clues on different crossword puzzles. Crossword clues for KNOWNOTHING Showing 1 to 4 of 4 results Clue(s) "Party on whose ticket Fillmore ran unsuccessfully for president, 1856" Be totally ignorant (OWN) Not so smart with zilch? Secret party of the 1850's.