The antonyms for the word "more halfdone" are complete, finished, polished, perfect, and fully cooked. These antonyms connote the opposite of being partially or incompletely done. The word "complete" suggests that something has been done in its entirety, while "finished" implies the completion of a task or project. "Polished" and "perfect" suggest that an action has been completed to a high standard or with excellence. Finally, "fully cooked" indicates that food has been prepared completely, so it is safe to consume. These antonyms highlight the importance of finishing tasks or projects, as well as the need to strive for excellence and completeness in everything we do.