Most overnice is an adjective that describes someone who is excessively particular or fussy. Antonyms for this term can include easygoing, laid-back, casual, informal, and relaxed. These words refer to someone who is not uptight or excessively demanding about small details. Rather, they tend to be more flexible and adaptable in their approach to life. Other antonyms for most overnice could include carefree, nonchalant, simple, uncomplicated, and easy. Together, these words represent an alternative perspective to the idea of being overly concerned with minor details and instead emphasizing a more relaxed and easygoing lifestyle.