Main entry: unable
Definition: (usually followed by `to') not having the necessary means or skill or know-how
Usage: unable to get to town without a car; unable to obtain funds
Antonyms: able
Definition: (usually followed by `to') having the necessary means or skill or know-how or authority to do something
Main entry: unable
Definition: (usually followed by `to') lacking necessary physical or mental ability
Usage: dyslexics are unable to learn to read adequately; the sun was unable to melt enough snow
Antonyms: capable
Definition: (usually followed by `of') having capacity or ability
Antonyms: capable
Definition: (followed by `of') having the temperament or inclination for
Main entry: ineffective, ineffectual, unable
Definition: lacking in power or forcefulness
Usage: an ineffectual ruler; like an unable phoenix in hot ashes
Antonyms: stiff, strong, potent
Definition: having a strong physiological or chemical effect
Definition: (of a male) capable of copulation