Crossword clues for the word: FAILSAFE The word FAILSAFE has appeared as an answer to at least 10 crossword clues on different crossword puzzles. Crossword clues for FAILSAFE Showing 1 to 10 of 10 results Clue(s) 1964 Cold War thriller starring Henry Fonda 1964 Sidney Lumet drama 1964 Walter Matthau movie Burdick-Wheeler novel Doomsday film of 1964 Eugene Burdick novel Fellow does badly with a heavy metal protection component Foolproof Guaranteed to work (Hyph.) Idiotproof