The term 'ISN'T SERIOUS' can be broken down into five crossword solutions: JOKES (5 letters), PRETENDS (8 letters), KIDS (4 letters), JESTS (5 letters), and JOKESAROUND (11 letters). Jokes are humorous statements or stories that are meant to make people laugh. Pretending is the act of pretending to be someone or something else, often for entertainment purposes. KIDS are young children who often enjoy joking around and playing pretend. Jests are playful remarks or actions that are meant to be funny. Jokesaround is a phrase used to describe someone who is always joking and not taking anything seriously.