There are many antonyms for the phrase "haddest carpet." Haddest carpet might refer to a luxurious or high-quality carpet, so antonyms might include: unkempt, dirty, tattered, ugly, cheap, or plain. Alternatively, haddest carpet could also suggest a carpet that is old and worn-out, in which case antonyms might include new, pristine, clean, fresh, or modern. The meaning of "haddest carpet" may also depend on the context in which it is being used. Regardless, antonyms provide a way to contrast or highlight the qualities of something, which can deepen our understanding and appreciation of it.