There are a variety of synonyms for the phrase "rode roughshod," which is generally used to describe someone acting in a reckless and uncontrolled manner. Some possible alternatives include "went berserk," "acted with impunity," "ran wild," "behaved recklessly," "blazed a trail," "showed no regard for rules," or "acted with abandon." These phrases suggest someone who is acting with little regard for others or consequences, often motivated by a sense of urgency or passion. No matter which synonym you choose, the idea remains the same: someone is acting without restraint or consideration, often to the detriment of those around them.