The crossword solutions for the term 'mechanical, stiff' are 'robotic'. The term 'robotic' refers to machines that are designed to operate autonomously or semi-autonomously and are programmed to perform specific tasks. They are often used in industrial settings to automate repetitive tasks, such as welding, assembly, and packaging. Robotic technology has also been used in medical and military applications. Robotic machines are typically characterized by their mechanical stiffness, which allows them to perform precise movements with minimal human intervention.