Princeton's WordNet

1. nonreversible, one-sided(adj)

   not reversible or capable of having either side out

2. unilateral, one-sided(adj)

   involving only one part or side

   "unilateral paralysis"; "a unilateral decision"

3. biased, colored, coloured, one-sided, slanted(adj)

   favoring one person or side over another

   "a biased account of the trial"; "a decision that was partial to the defendant"

Kernerman English Learner's Dictionary

1. one-sided(adjective)ʌn

   (of a competition, war, etc.) unfair because one team or player is much better

   a one-sided battle/conflict

2. one-sidedʌn

   (of a discussion, argument, etc.) unfair because only one point of view is given

   the one-sided way in which the media presents the issue

Wiktionary

1. one-sided(Adjective)

   Partial or biased in favour of one faction or demographic group

   We were robbed! That referee was definitely one-sided.

2. one-sided(Adjective)

   With one competitor dominant over the other

   It was a swift, one-sided fight, all over in the second round.

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