Direct opposites:
* Rational: This emphasizes logic and reason over intuition and spirituality.
* Empirical: This focuses on observation and evidence instead of speculation or divine intervention.
* Scientific: This highlights a systematic and objective approach, contrasting with the often subjective nature of mysticism.
Other options:
* Ordinary: This emphasizes the mundane and common, the opposite of the extraordinary and otherworldly nature of the mystical.
* Concrete: This suggests a grounded and tangible reality, contrasting with the abstract and intangible aspects of mysticism.
* Materialistic: This focuses on the physical world and rejects spiritual or metaphysical ideas.
Ultimately, the best antonym for "mystical" depends on the specific context and the meaning you're trying to express.