The word "unrestrainedness" refers to a lack of control or restriction. Some antonyms for this word could include restraint, control, discipline, regulation, moderation, and temperance. Restrained behavior involves acting with caution and prudence, as opposed to impulsiveness or recklessness. Control, on the other hand, implies a level of authority or power to direct or manage a situation, while discipline involves enforcing rules and order. Regulation refers to the process of implementing and following guidelines or standards for behavior, and moderation suggests balanced and reasonable behavior. Finally, temperance implies a sense of self-control and moderation in one's actions and attitudes.