INDUSTRIOUS EFFORT is an 8-letter term which can be defined as an ENDEAVOR. An ENDEAVOR is an ambitious or difficult undertaking that requires great effort and determination. It is often used to describe a task that requires hard work and dedication in order to achieve success. In this case, INDUSTRIOUS EFFORT is a phrase that implies a great deal of effort and dedication to a task. It is a phrase that emphasizes the importance of hard work and perseverance in order to reach a goal.