This is the 15934th most frequent Russian word.
противоположной
Opposite.
In this sentence, 'противоположной' is used as an adjective to describe the side of the street located across or opposite to the reference point.
Она живёт на противоположной стороне улицы.
She lives on the opposite side of the street.
Here, 'противоположной' is an adjective defining the nature of the opinions as being diametrically different or contrasting.
Мнения у них совершенно противоположной направленности.
Their opinions are of completely opposite directions.
In this example, 'противоположной' describes the platform located on the other side or facing the reference position.