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
Human beings may well be unable to break free of the dictatorship of greed that spreads like a miasma over the world, but no longer will we be an inarticulate and ignorant humanity, confused by our enslavement to superior cruelty and weaponry. Alice Walker