Crossword clues for the word: YOUTHFUL The word YOUTHFUL has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for YOUTHFUL Showing 1 to 9 of 9 results Clue(s) "Like Superboy, e.g." Acting like a kid Fresh-faced Like kids' enthusiasm Still a spring chicken Vernal Vigorous Vigorous solver getting flu shot -- that's not so bad Vigorous; active