This is the 3491st most frequent Portuguese word.
oposto
Opposite.
In this sentence, 'oposto' is used as a noun meaning 'opposite', referring to a concept that is contrary or inverse to another.
O oposto do amor é o ódio.
The opposite of love is hate.
Here, 'opostas' is used as an adjective describing 'opiniões', showing a conflicting or different nature.
Eles têm opiniões opostas sobre o tópico.
They have opposing opinions on the topic.
In this case, 'oposto' functions as an adjective qualifying 'sentido', indicating a contrary or reverse direction.