Becoming fair, a phrase typically used to describe someone's physical appearance, has many antonyms. The opposite of becoming fair is becoming dark or tanned. When someone is becoming fair, they are usually trying to lighten their skin or reduce blemishes, so antonyms can also include becoming blotchy or uneven. Another antonym for becoming fair may be becoming unhealthy or sickly, as fair skin may represent good health. It can also be said that the antonyms for becoming fair could be becoming less attractive or less appealing. Ultimately, the antonyms for becoming fair depend on the situation and the context in which they are being used.