Inventive thought is the process of coming up with creative and original ideas. It is often used in problem solving and can be a great asset to any team. The term INVENTIVE THOUGHT can be broken down into two crossword solutions: IDEA (4 letters) and BRIGHTIDEA (10 letters). IDEA is a noun that refers to a plan or thought that is created to solve a problem or to improve something. BRIGHTIDEA is a combination of two words, bright and IDEA, which together refer to an IDEA that is particularly clever or innovative.