Pathogenically refers to something that is caused by a pathogen, which is an organism that causes diseases. Synonyms for this word include infectiously, contagiously, and virulently. Infectiously is used to describe something that spreads or is transmitted from one person or organism to another through contact, air, or other means. Contagiously is similar to infectiously but typically refers to the ease with which the disease spreads. Virulently describes something that is highly infectious and potentially deadly. Other synonyms for pathogenically include disease-causing, harmful, and deleterious. These words all convey the idea of something that can cause illness or harm.