The term 'in stitches' is a phrase used to describe someone who is laughing uncontrollably. The crossword solutions for this term are SEAMED (6 letters), SUTURED (7 letters), SEWN (4 letters), RIANT (5 letters), and SEWNUP (6 letters). All of these words refer to the act of stitching, which is the process of joining two pieces of fabric together with thread. Seamed and SUTURED refer to the process of sewing two pieces of fabric together with a needle and thread, while sewn and sewnup refer to the act of using a sewing machine to join two pieces of fabric together. RIANT is an adjective that describes someone who is laughing heartily or joyfully.