The phrase "always unable to" is correct and usable in written English.
It can be used to express a consistent state of incapacity or lack of ability to do something.
Example: "Despite her best efforts, she felt always unable to meet the expectations set by her peers."
Alternatives: "perpetually incapable of" or "constantly unable to".
I took to walking at dusk, looking in at windows to see families being normal, always unable to come to terms with the loss.
During the two years my tutee and I worked together, she tried to pass the English section of the G.E.D. several times and didn't succeed, always unable to write a sufficiently coherent essay.
Mandela was always unable to pin-point when he first became politicised, though his circle of white and radical friends widened after he started a part-time law degree at the University of the Witwatersrand in 1943.
Think back to when we entered freshmen year, awkwardly walking through the halls of the old building, attempting, but always unable, to avoid getting pressed between upperclassmen in the four-way intersection.
Were the Tunisian authorities always unable to identify you?
Although zonkeys are super-cute, part of the reason there aren&apos t more of them is because they are almost always unable to breed unaided and are susceptible to health problems and dwarfism.
Finally, we examined whether respondents with a mobile phone reported each of two common barriers to mobile phone use: frequently or always being unable to access a mobile phone signal, and frequently or always lacking mobile phone credit or "minutes" on their device.
He is always… Unable to sleep, Albert wanders through his dark apt.
"You see the kids always crying, unable to forget the frightening things they saw.
He is, for one thing, irresponsible and not always honest, unable to admit to Sophina or Wanda that he has been fired from his supermarket job for chronic lateness.
