Malarious is a word used to describe something that is infected with malaria or has the potential to cause malaria. There are several synonyms for this term, including malariogenic, malarial, and malaria-prone. These words all describe conditions or areas where mosquitoes carrying the malaria parasite are common, and where individuals are at a higher risk of contracting the disease. Other synonyms for malarious include pestilential, infectious, and disease-ridden. These words emphasize the dangerous and harmful nature of malaria and its ability to spread quickly and easily in areas with high mosquito populations.