opposite from, opposite of, opposite to

As a noun, opposite may stand alone or be followed by the preposition of.

• Madeleine believes just the opposite!
• What is the opposite of up?

As an adjective, opposite may stand alone or be followed by the preposition to or occasionally from.

• The cars were travelling in opposite directions when the accident occurred.
• Hyacinth’s opinions are often opposite to Pierre’s.
• Keith’s cottage is on the same lake but on the opposite side from (or to) ours.

Opposite may also function as a preposition. The preposition opposite should not be followed by of or to.

• Jean-Luc lives in the house opposite ours.
• Two dozen condos will be built opposite the theatre (not opposite of the theatre or opposite to the theatre).