The word "farcical" means something that is absurd or ridiculously exaggerated, often in a humorous way. The opposite of this would be something serious, which is far from absurd or humorous.
- "Hysterical" refers to a state of uncontrollable emotion, not the opposite of farcical.
- "Terrible" refers to something bad, but not necessarily the opposite of farcical.
- "Facetious" refers to treating serious issues with inappropriate humor, which is close to farcical but not its opposite.
Therefore, the correct antonym is "serious."