The antonyms for the expression "more sober-minded" can be varied depending on the context in which the term is being used. Some of the antonyms that could be used include "reckless," "irresponsible," "impulsive," "careless," "heedless," "foolhardy," or "unwise." Conversely, the phrase "more sober-minded" connotes sound judgment, thoughtfulness, and mindfulness toward consequences, so antonyms would represent an extreme in the opposite direction. It is essential to keep in mind that the opposite of "more sober-minded" will depend on the particular circumstances as the expression is often used in various contexts, including work, personal life or social settings.