The antonyms of the word "more phenom" can vary depending on the context. If we are referring to a physical phenomenon, the opposite could be "less phenom" or "none." If we are talking about a person or thing that is outstanding, incredible, or exceptional, the antonyms could be "average," "mediocre," or "nothing special." Similarly, if we're discussing a performance, an antonym could be "boring" or "mundane." Context is crucial when determining antonyms, and it's important to consider the meaning behind the word in question before identifying its antonyms.