There are several synonyms for the word "noncontagious" that can be used to describe a disease or illness that cannot be passed from one individual to another. These include noninfectious, nontransmissible, noncommunicable, and nonspreading. Each of these terms can be used to indicate that a condition does not pose a risk of spreading through contact or proximity. For example, a noncontagious disease may be caused by a genetic disorder or environmental exposure, and cannot be transmitted through casual interaction. Using these different synonyms can help to emphasize the lack of contagiousness and provide a clearer understanding of the nature of the condition.