Crossword clues for the word: KNUCKLEBALL The word KNUCKLEBALL has appeared as an answer to at least 11 crossword clues on different crossword puzzles. Crossword clues for KNUCKLEBALL Showing 1 to 11 of 11 results Clue(s) Certain slow pitch Fluttering baseball pitch Fluttering pitch Pitch with little spin that moves erratically and unpredictably Slow pitch with a little spin Tough-to-hit pitch Tricky delivery Tricky pitch Unique slow pitch Unpredictable pitch Wavering pitch.