Beyond reason refers to a situation or argument that cannot be justified logically. Some synonyms for this phrase include absurdity, irrationality, madness, illogicality, unreasonable, and senselessness. For instance, an argument that is beyond reason cannot be supported by facts or logical reasoning. In this sense, the phrase connotes a level of absurdity that is difficult to comprehend or justify. Similarly, actions or decisions that are beyond reason are considered to be irrational or senseless, implying a lack of purpose or meaning. It is important to note that using synonyms can help writers to avoid repetition and enhance the style and clarity of their writing.