The word "retardate" means a person or thing that is delayed or late. The antonyms, or opposite words, for retardate would then be words that mean punctual or timely. Some antonyms to consider include "early," "on time," "prompt," "ahead of schedule," and "timely." Additionally, words like "advance," "accelerate," "quick," and "speed up" serve as antonyms because they are opposite in meaning to anything associated with delay. The use of antonyms is valuable in expanding vocabulary and communicating effectively. By knowing the antonyms for a word like retardate, individuals can better express themselves in various situations.