The opposite of "premier / première" (first) is "dernier / dernière" (last) in French.
The opposite of "dessous" is "dessus" in French.
Premier or 1er
Mon premier Noël means 'my first Christmas' in French.
It is the masculine form of first.
The opposite of arriver in French is en face de l'arrivant.
For comparing quality, the opposite of "premier" (superior) could be inferior or poor. Where premier assumes the very best, the opposite is worst or poorest.
The feminine word for "premier" in French is "première."
"bon premier anniversaire / joyeux premier anniversaire / heureux premier anniversaire"
Premier étage in French is "first floor" in English.
The ordinal number premier in French corresponds to the English ordinal number "first".
"First day of school" in French is "premier jour d'école."
The French premier, who had lived through two German invasions of France, and was determined to prevent future invasions
The opposite of large in French is "petit".
The opposite of "long" in French is "court."
The opposite of "dessous" is "dessus" in French.
If you mean as in "movie premier" than it's "Grande première"
First is "premier / première" in French.