There are several synonyms for the word "dafter" that can be used depending on the context. Some of the common synonyms include "sillier," "more foolish," "more absurd," "more ridiculous," "more insane," and "more ludicrous." These words are often used to indicate behavior or decisions that seem bizarre, incomprehensible, or illogical. When describing people or situations that are beyond reason or common sense, these synonyms can be useful. However, it is important to note that using words like "dafter" or its synonyms to describe someone or something can be perceived as negative or insulting, so it's best to use them with care.