Crossword clues for the word: RULEOFTHUMB The word RULEOFTHUMB has appeared as an answer to at least 12 crossword clues on different crossword puzzles. Crossword clues for RULEOFTHUMB Showing 1 to 12 of 12 results Clue(s) *General principle "Red-right-returning, e.g." Common sense procedure General guideline Hitchhiker's principle? Hitchhikers' code? Nonscientific gauge Practical but imprecise approach Practical method of procedure Unscientific procedure Widely applied principle You finally sign paper protected by one of 32 points giving rough guidance