The word "un-curbed" refers to something that is not restrained or controlled. Its antonyms, or opposites, include words like curbed, limited, restricted, contained, checked, and governed. When something is curbed or limited, it means that its excesses or negative effects are managed or kept in check. A restricted or contained item is similarly limited, but may focus more on the size or scope of the item in question. A checked item is one that is subject to controls or inspections. Finally, a governed item is one that is regulated or directed by an outside authority. These antonyms all imply a greater degree of control and management than the term un-curbed suggests.