Crossword clues for the word: LOONIEST The word LOONIEST has appeared as an answer to at least 6 crossword clues on different crossword puzzles. Crossword clues for LOONIEST Showing 1 to 6 of 6 results Clue(s) Having the fewest marbles? Least sensible Most insane Most lamebrained Most out-to-lunch Super pixilated.