Powerless
Part of speech: adjective
Definition: Lacking sufficient power or strength. Lacking legal authority.
Example sentence: I hate smiling. It makes me feel weak and powerless and small. I've always been like that; I don't smile in any pictures.
Ineffective
Part of speech: adjective
Definition: not having the desired effect; ineffectuallacking in ability; incompetent or inadequate
Example sentence: Balance is so important. We all have to cut up our clock to find out what works for you. If you're ineffective, you're using bad clock management, and you have to adjust. Using a basketball reference, the team who wins is the team that can make adjustments in real time.