Most curbed implies that something is restricted or controlled to the greatest extent. Therefore, the antonyms for this phrase would be unbridled or uncontrolled. Unbridled means something that is unrestrained or free from limitation. This could refer to behaviors, emotions, or actions that are allowed to operate without any constraints. In contrast, uncontrolled refers to a lack of ability to manage or govern something. It suggests a wild or chaotic state where there is no order or structure. Both of these antonyms stand in direct opposition to the idea of something being most curbed, indicating a complete lack of restraint or regulation.