The phrase "un-reasons" refers to illogical or non-existent justifications for something. There are many different synonyms for this term, including excuses, pretexts, rationalizations, and justifications. These words all describe ways in which people try to justify their actions or behaviors in ways that don't make sense or aren't rooted in reality. Other synonyms for "un-reasons" may include flimsy excuses, hollow arguments, or weak justifications. All of these words suggest that someone is trying to explain away their actions or decisions in a way that doesn't hold up to scrutiny or logical analysis.