Unilateral (3-5)
I believe the answer is:
one-sided
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unilateral</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that unilateral can be written as one-sided)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for one-sided that I've seen before include "Unfair or uneven" , "So denied being unfair or biased" , "Grossly unequal; biased" , "So denied being partisan or unfair" , "Unfair or partisan - single dimension?" .)