Crossword clues for the word: SERIOUSNESSIS The word SERIOUSNESSIS has appeared as an answer to at least 2 crossword clues on different crossword puzzles. Crossword clues for SERIOUSNESSIS Showing 1 to 2 of 2 results Clue(s) Start of a quote about solemnity Start of a quote by P.J. O'Rourke