The antonyms for the word "most curtailed" would be words that suggest increase or expansion. Some examples of antonyms for curtailed include amplification, expansion, augmentation, enlargement, and extension. Each of these words suggests that something is being added to, rather than subtracted from. For example, if a person's freedom is being curtailed, an antonym would be to give them more freedom or to expand their choices. Similarly, if a project is being curtailed, an antonym would be to expand it or add additional resources to increase its scope.