Noun
Want of capacity; lack of physical or intellectual power; inability.
Want of legal ability or competency to do, give, transmit, or receive something; inability; disqualification; as, the inacapacity of minors to make binding contracts, etc.
Source: Webster's dictionaryWhat now on the other hand makes people sociable is their incapacity to endure solitude and thus themselves. Arthur Schopenhauer
The only abnormality is the incapacity to love. Anaïs Nin
No man can exactly calculate the capacity of human genius and stupidity, nor the incapacity of will. B. H. Liddell Hart
Man shouldn't be able to see his own face. That's what's most terrible. Nature gave him the possibility of not seeing it, as well as the incapacity of not seeing his own eyes. Fernando Pessoa
Prudence is a rich, ugly, old maid courted by incapacity. William Blake
So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians. Georg Christoph Lichtenberg