considering or showing only one side of a question, subject etc in a way that is unfair [↪ biased, balanced]:
The newspapers give a very one-sided account of the war.
an activity or competition that is one-sided is one in which one person or side is much stronger or does much more than the other:
a very boring, one-sided game
The conversation was very one-sided.
—one-sidedness noun [uncountable]