Radiation sensitivities refer to the susceptibility of living organisms, such as cells, tissues, or organisms, to damage caused by radiation exposure. The antonyms for radiation sensitivities are "resistance" or "immunity." For instance, some organisms, such as bacteria and certain viruses, have developed natural resistance to radiation, allowing them to survive in extreme environments like radioactive nuclear waste sites, while others may acquire immunity to radiation exposure through medical treatments or genetic modifications. In contrast, radiation-sensitive organisms may experience harmful effects, such as genetic mutations, cell death, and radiation sickness, from exposure to even small amounts of radiation. Understanding radiation sensitivities and its antonyms can help in developing effective strategies to protect humans and other living organisms from radiation exposure.