Final answer:
The antonym for 'frequent' is 'occasional,' as it signifies something that happens at irregular or infrequent intervals compared to the short intervals implied by 'frequent.'
Step-by-step explanation:
The antonym for frequent is occasional. An antonym is a word that has the opposite meaning of another. Frequent means happening or occurring at short intervals, whereas occasional means happening at irregular or infrequent intervals.
The other options provided, such as 'constant' and 'repeated,' are synonyms of frequent, meaning they share a similar meaning. 'Unfair' is unrelated to the frequency of an occurrence, so it is not an appropriate antonym in this context.
The antonym for 'frequent' is 'occasional'. 'Frequent' means happening often or regularly, while 'occasional' means happening from time to time or infrequently.
For example, if you go to the movies every week, that would be considered frequent. On the other hand, if you only go to the movies once in a while, that would be considered occasional.