The term "most stipulated" is often used to imply a requirement or condition that is seen as essential or mandatory. When considering possible antonyms for this term, one might think of words that suggest freedom, flexibility, or discretion. For example, terms like optional, discretionary, or negotiable could be used to describe situations where there is no strict requirement or where there is room for discussion or choice. Other antonyms might include words like casual, informal, or relaxed, which suggest an absence of strict rules or requirements. Overall, the antonyms for "most stipulated" are words that suggest a lack of rigidity, formality, or inflexibility.