Based on meaning:
* Randomness: If a theme provides structure and focus, randomness represents the opposite.
* Chaos: Similar to randomness, chaos implies a lack of order and direction, the opposite of a unifying theme.
* Disunity: A theme creates a sense of coherence. Disunity suggests a lack of connection and shared purpose.
* Divergence: A theme points towards a central idea, while divergence implies multiple, unrelated directions.
Based on specific use:
* Individuality: If the theme is about a shared experience, individuality represents unique, separate experiences.
* Specific detail: If the theme is a general idea, a specific detail focuses on a particular aspect.
* Absence: If a theme is present, its absence signifies the lack of a unifying idea.
It's important to consider the context of the word "theme" to choose the best antonym. For example, if you're talking about the theme of a party, the opposite might be "lack of direction" or "random activities." If you're discussing the theme of a novel, the antonym could be "lack of coherence" or "individual stories."
Ultimately, the best antonym will depend on the specific meaning you want to convey.