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")
unable -- ((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")
ineffective, ineffectual, unable -- (lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes")
(Sound)
