The crossword clue for 'furious' that I've come across often is 'mad.' It's a short and punchy word, perfect for when you're in a tight spot with the puzzle. Another great option is 'angry,' which really captures that intense feeling and fits well into many grids. If you need a longer word, try 'enraged.' Crossword puzzles love those synonyms! Hope this helps keep your crossword game strong!