Crossword clues for the word: BRAINIAC The word BRAINIAC has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for BRAINIAC Showing 1 to 5 of 5 results Clue(s) 2006 Ken Jennings book... or the author himself Comic book villain Highly-clever sort in Arabic novel Ken Jennings' book on trivia buffs Really smart one