The opposite of cold in french is "chaud" meaning hot.
"Plus" is the French equivalent of the English "more", and so the opposite of "less"
Jeune means young in French. The opposite is 'vieux' (masc.) or 'vieille' (fem.).
forte = loud Piano = quiet
malheureux, malheureuse
The opposite of "premier / première" (first) is "dernier / dernière" (last) in French.
cold
it would be "opposé"(also the word for contrary is contraire)
The French word for "big" is "grand," and the opposite is "petit," which means "small."
The opposite of "joli" in French is "mochte".
grand, grande is the opposite of petit, petite.
The opposite of the French word "cruelle" is "bienveillante," which means kind or benevolent.
"Plus" is the French equivalent of the English "more", and so the opposite of "less"
Jeune means young in French. The opposite is 'vieux' (masc.) or 'vieille' (fem.).
forte = loud Piano = quiet
Commencer means to start or to begin in French. The opposite would be finir (finish) or terminer (to end).
malheureux, malheureuse
Sans being French for "without" I would think you're looking for Avec, French for "with"