Here are some examples of how it can be used:
* "C'est trop nul, on a perdu le match." (It's too bad, we lost the game.)
* "Ton dessin est trop nul, essaie encore." (Your drawing is too bad, try again.)
* "Ce film est trop nul, je m'attendais à mieux." (This movie is too bad, I expected better.)
It's important to note that "trop nul" can be considered a slight insult, especially if used towards a person. It's generally better to use it to describe an object or situation rather than a person directly.
There are other, more polite ways to express disappointment in French, such as "C'est dommage" (It's a shame) or "C'est pas terrible" (It's not great).