"More Improviso" refers to something that is done without preparation or planning. Antonyms for this phrase may include words like "calculated", "conscious", "deliberate", "premeditated", "planned", "systematic", "thoughtful" and "intentional". Each of these antonyms represents an approach to an action, decision or task that is the opposite of doing something more improviso. When striving for success, being deliberate and thoughtful can often lead to better outcomes than simply taking a more improvised approach, so it is important to consider all options before making a decision or taking action.