The term "in fecund" is rarely used in everyday language, and therefore, it is challenging to find direct antonyms for it. However, the word "fecund" generally means fertile, productive, or fruitful. Therefore, antonyms for fecund would be barren, infertile, or unproductive. If something is in fecund, it means it is not fertile or productive at that particular moment. Therefore, antonyms for "in fecund" would be "productive" or "fertile." These antonyms provide a contrast to the lack of productivity or fertility implied by the phrase "in fecund." Whether writing or speaking, understanding antonyms is crucial in conveying information accurately and effectively.