Mothballed means to store something away for future use. Therefore, the antonyms for the word "more mothballed" would be words that indicate active use or being readily available. Some possible antonyms may include: active, operational, in use, active service, functioning, in operation, and in service. These words suggest that something is being utilized or currently in use rather than stored away. The opposite of mothballed can also be phrases like in action, buzzing, active, dynamic, up and running. By using these antonyms, it affirms that something is in good condition and ready to use.