Contrary to fact
I believe the answer is:
false
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contrary to fact</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for false that I've seen before include "Spurious, untrue" , "Fake; untrue" , "Sham" , "Not genuine or real" , "Forged" .)