Fallacious (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fallacious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wrong that I've seen before include "Erronious" , "Erroneous" , "Injury - incorrect" , "Incorrect, illegal or immoral" , "Not correct" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fallacious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for untrue that I've seen before include "Fallacious" , "Wrong" , "Counter-factual" , "disloyal" , "Spurious" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fallacious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that fallacious can be written as unsound)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for unsound that I've seen before include "Not strong or free from defect - perhaps evidence in court" , "Unreliable, not well" , "Not reliable, like some evidence" , "Fallacious (argument)" , "Lame" .)