Definition of unable

• (usually followed by `to) not having the necessary means or skill or know-how; "unable to get to town without a car"; "unable to obtain funds"
• (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"
• lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes"