Below are possible answers for the crossword clue Useless - nebula.
6 letter answer(s) to useless - nebula
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"
(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"
lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes"
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