Unsuccessful (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unsuccessful</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for futile that I've seen before include "Trifling and ineffectual" , "Ineffectual,in vain" , "Useless, a waste of effort" , "In vain, a waste of time" , "Ineffectual, a waste of time" .)
(Other definitions for failed that I've seen before include "Didn't make it - not well" , "Did not succeed, perhaps at exam" , "Was unsuccessful, did not pass exam" , "Didn't succeed" , "Bankrupt" .)