Adjective
1. (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"2. (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"3. lacking in power or forcefulness;
"an ineffectual ruler""like an unable phoenix in hot ashes"