Not able; not having sufficient strength, means, knowledge, skill, or the like; impotent' weak; helpless; incapable; -- now usually followed by an infinitive or an adverbial phrase; as, unable for work; unable to bear fatigue.
My mother said I must always be intolerant of ignorance but understanding of illiteracy. That some people, unable to go to school, were more educated and more intelligent than college professors. Maya Angelou
I think that humans have a huge capacity to carry pain and sadness. There are things that haunt us our entire lives; we are unable to let them go. The good times seem almost effervescent and dreamlike in comparison with the times that didn't go so well. Henry Rollins