Meaning of “opposite” - Learner’s Dictionary

opposite

adjective us uk /ˈɒpəzɪt/
They were standing at opposite ends of the room.He began walking in the opposite direction.They sat at opposite ends of the table.She struck out for the opposite bank.You need to put your weight on your opposite leg.
OTHER SIDE

B1 in a position facing something or someone but on the other side:

on the opposite page
in the opposite corner
We live on opposite sides of the city.
I noticed a gate at the opposite end of the courtyard.
DIFFERENT

B2 completely different:

Police attempts to calm the violence had completely the opposite effect.

(Definition of “opposite adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)