I am unable to solve my problems myself.
We are unable to fulfill your demands.
Poor parents or parents under the poverty line are unable to afford the education expenses of their kids.
I am unable to understand what she wants.
Addiction to harmful substances and lack of essential nutrients in the body can result in imperfect functioning of cells unable to do what is required of them to maintain a healthy state.
Diabetes mellitus is a disorder in which the body is unable to control the use of sugar as a source of energy.
I am unable to find any task to my liking.
Though I am working from morning till night, I am unable to feed my stomach.