Hubba-hubba is not a word with any antonyms. It is an expression of admiration and attraction, a playful way of appreciating someone's appearance. Some might argue that the opposite of hubba-hubba would be an expression of disinterest or disgust, but this is not an antonym. Instead, it is a contrasting emotion or feeling. Antonyms are words that have opposite meanings, such as hot and cold, bright and dark, or happy and sad. Therefore, there are no antonyms for hubba-hubba.