Antonyms are words that have opposite meanings to another word. In this case, the word "Miguel de Unamuno" cannot have antonyms as it is a proper noun, the name of a Spanish philosopher, writer, and teacher.
However, if we were to consider the qualities attributed to Miguel de Unamuno, we could suggest some antonyms. For instance, Unamuno was characterized as introspective, philosophical, and intellectual. Antonyms for these qualities could be superficial, shallow, or unintellectual.
Additionally, Unamuno was known for his strong, sometimes conflicting emotions. Antonyms for this could be unfeeling, apathetic, or dispassionate.