Crossword clues for the word: SMOOTHLY The word SMOOTHLY has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for SMOOTHLY Showing 1 to 5 of 5 results Clue(s) """Sing thou ___"": Campion" Goes without a hitch in most holy play How a well-oiled engine should run Swimmingly With no problems or difficulties