What is the opposite of Demain?

The opposite of "Demain" (French for "tomorrow") depends on what you mean by "opposite."

Here are some possibilities:

* Direct opposite in time: Hier (French for "yesterday")

* Opposite in meaning, referring to the past: Aujourd'hui (French for "today")

* Opposite in meaning, referring to the present: Maintenant (French for "now")

* Opposite in meaning, referring to a hypothetical future: Jamais (French for "never")

The best opposite for "Demain" really depends on the specific context of your sentence.