The term 'Renders Powerless' can be summarized by two crossword solutions: 'HAMSTRINGS' (10 letters) and 'Unplugs' (7 letters). HAMSTRINGS refers to the act of weakening or incapacitating someone or something, usually by cutting off their resources or limiting their mobility. Unplugging is the act of disconnecting a device from its power source, thus rendering it powerless. Both of these terms are used to describe the act of taking away someone or something's power or ability to act.