The opposite of plus (more) is moins (de) meaning less (of).
"Plus" is the French equivalent of the English "more", and so the opposite of "less"
The opposite of "long" in French is "court."
The opposite of large in French is "petit".
The opposite of "dessous" is "dessus" in French.
The opposite of "joli" in French is "mochte".
grand, grande is the opposite of petit, petite.
The opposite of "contre" in French is "avec," which means "with."
The opposite of "arriver" in French is "partir," which means "to leave" or "to depart."
The opposite of "oui" in French is "non," which means "no."
lent
The opposite of arriver in French is en face de l'arrivant.
The opposite of cold in french is "chaud" meaning hot.