General Antonyms:
* Randomness: If "theme" implies order or coherence, "randomness" suggests a lack of any unifying principle.
* Chaos: Similar to randomness, chaos implies a complete absence of structure or organization.
* Inconsistency: If "theme" suggests consistency or unity, "inconsistency" implies a lack of coherence or a change in direction.
Context-Specific Antonyms:
* Diversion: If "theme" refers to the main subject of a piece of writing, a "diversion" would be a departure from that subject.
* Contradiction: If "theme" refers to a central idea, a "contradiction" would be a statement that goes against that idea.
* Departure: If "theme" refers to a consistent pattern, a "departure" would be a break from that pattern.
Ultimately, the best antonym for "theme" depends on the specific context in which the word is used.