When we talk about antonyms for the phrase "making reasonable," several words may come to mind, such as irrational, illogical, unpredictable, or nonsensical. These words imply a lack of sound judgment or failing to understand a situation's context. Someone who is making unreasonable decisions or taking irrational actions may be seen as reckless or impulsive. On the other hand, being reasonable is synonymous with being logical, rational, or practical, suggesting a careful consideration of facts and a balanced approach. Thus, it is essential to consider different perspectives and weigh the pros and cons when making decisions to ensure that they are reasonable and informed.