* Antonyms are direct opposites. "Hot" and "cold" are antonyms, as are "up" and "down." While humor can be a counterpoint to tragedy, it doesn't directly negate it.
* Tragedy can be humorous. Some tragedies are written with comedic elements, or a situation may be tragic but also have a funny side.
* Humor can be tragic. Dark humor can be used to deal with tragic situations, and comedic events can have tragic consequences.
A better antonym for tragedy might be:
* Comedy
* Joy
* Happiness
* Triumph
In conclusion: "Humorous" and "tragedy" are often seen as opposites, but they are not strict antonyms. They can coexist and even overlap in certain situations.