Antonyms for the phrase "are suffused" would be words that suggest a lack of diffusion or dispersion, such as "are concentrated," "are confined," or "are isolated." These antonyms carry a connotation of restriction or limitation, suggesting that whatever substance or quality is being discussed is not widespread or evenly dispersed throughout a larger area or group. Other possible antonyms could include words like "are contracted" or "are diminished," which indicate a reduction or shrinking of the substance or quality in question. Overall, antonyms for "are suffused" would emphasize a lack of diffusion, expansion, or spread, highlighting restriction or limitation instead.