Numinousness is a word used to describe a sense of the supernatural or divine. Antonyms, or words with opposite meanings, would therefore include words that describe a lack of this sense, such as mundane, ordinary, or unremarkable. Other antonyms could include words that describe something negative or frightening, such as terrifying, dreadful, or intimidating. Alternatively, words with a more rational or scientific bent could also serve as antonyms, such as grounded, logical, or rational. Ultimately, the most appropriate antonyms for numinousness will vary depending on the context and the intended meaning of the writer or speaker.