The antonyms for the word "fix with" can vary depending on the context of usage. If we consider "fix with" to denote a permanent solution, the antonyms could include "temporary fix," "band-aid solution," or "make-shift patch." On the other hand, if we take it to mean "to attach or connect," then the antonyms could be "detach," "disconnect," or "detach." In a broader sense, if "fix with" is interpreted as "to repair or mend something," then the antonyms could be "break down," "ruin," or "damage." In summary, understanding the context of usage is vital in finding suitable antonyms for the phrase "fix with.