The word "bittier" is not a word recognized by the English language. Therefore, there are no official antonyms for it. The closest alternative is to use the word "bit" and its antonyms. The antonyms of "bit" would include words such as "whole," "entire," "intact," or "complete." These words oppose the notion of a "bit" or a small part of something. It is important to note that using non-recognized words can cause confusion for the reader. Therefore, it is recommended to use recognized words to avoid misunderstanding and promote effective communication.