incapable

adjectives

(followed by `of') lacking capacity or ability
"incapable of carrying a tune"; "he is incapable of understanding the matter"; "incapable of doing the work"
is derived from
is derived from
antonym
is similar to
(usually followed by `to') lacking necessary physical or mental ability
"dyslexics are unable to learn to read adequately"; "the sun was unable to melt enough snow"
see also
not qualified or suited for a purpose
"an incompetent secret service"; "the filming was hopeless incompetent"
is an attribute of
the quality of being capable -- physically or intellectually or legally
"he worked to the limits of his capability"
is an attribute of
an aptitude that may be developed
not being susceptible to or admitting of something (usually followed by `of')
"incapable of solution"
is derived from
is similar to
not susceptible to
(followed by `of') not having the temperament or inclination for
"simply incapable of lying"
is derived from
antonym
not meeting requirements
"unequal to the demands put upon him"
is derived from