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(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"
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(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"
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lacking in power or forcefulness;
"an ineffectual ruler"
"like an unable phoenix in hot ashes"