one-sided

Short definition from Wiktionary

Adjective

1. 1
   Partial or biased in favour of one faction or demographic group.
2. 2
   With one competitor dominant over the other.
3. 3
   Out of proportion or lopsided.
4. 4
   Having only one side, like a Möbius strip.
5. 5
   Turned to one side.
6. 6
   That is necessarily or absolutely different than the respective coordinate alethic or temporal modality, but not its opposite.