Antonyms for the term "more beautifying" would be words that describe something that is not capable of enhancing or improving the appearance of something or someone. Such opposites might include words like unattractive, plain, unsightly, or unpleasant. These words might be used to describe a person who is not particularly physically appealing, or a product that does not work as advertised to enhance one's looks. Alternatively, antonyms might be words that describe something that detracts from or harms one's appearance, such as dirt, grime, or damage. Whatever the context, antonyms for "more beautifying" all connote the opposite of something that is conducive to creating a more attractive or aesthetically pleasing appearance.