"Not a jot" is a phrase that means not even a small amount or a tiny bit. It is often used to emphasize the completeness of something. However, there are some synonyms that can be used instead of this phrase. One such synonym is "not an iota," which means the same thing. Other synonyms for "not a jot" include "not one bit," "not at all," "not a whit," and "not a smidgen." These synonyms can be used interchangeably depending on the context in which they are being used. Using these synonyms can help to vary the language used in writing or speech.