Ineffective (5-5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ineffective</span>' is the definition.<br/ ><span class="explanation-format__explanation">(associated in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for useless that I've seen before include "Of no practical or worthwhile application" , "idle" , "Having no beneficial function" , "Worth zilch" , "Poor" .)
(Other definitions for wishy-washy that I've seen before include "Watered-down" , "Ineffectual" , "Diluted" , "Feeble, insipid" , "Bland -- pale" .)