The term "transmittable" refers to the ability of a disease, virus, or infection to spread from one person to another. Its antonyms refer to characteristics that prevent such transmission. Some examples include "noncontagious," "noninfectious," "immunized," and "treatable." These terms refer to conditions that cannot easily spread from one individual to others, either because there is no risk of contagion or because medical treatment can prevent transmission. Other antonyms include "incurable," "untreatable," and "inactive," which describe conditions that cannot be cured or stopped from spreading. In summary, antonyms of transmittable describe conditions that are not easily spread through contact or can be effectively treated to prevent transmission.