Lusus Naturae, meaning 'freak of nature,' is a term used to describe something unusual or abnormal. Its antonyms would be words that denote normalcy or conformity. For instance, 'typical,' 'ordinary,' 'commonplace,' and 'mundane' are antonyms of Lusus Naturae. The concept is highly subjective and open to different interpretations, but it often pertains to things that don't follow the natural order or are considered an aberration. When discussing the antonyms for Lusus Naturae, one could also include words such as 'regular,' 'conventional,' 'traditional,' and 'predictable,' which signify a lack of deviation from the norm. Overall, the antonyms of Lusus Naturae refer to things that are standard, usual, and not out of the ordinary.