<p><strong>Adjective</strong></p><ul><li>Physics, Chemistry: Of, relating to, exhibiting, or caused by radioactivity: A pressing issue in post-Soviet Russia is safe long-term storage of radioactive waste, from both military and civilian applications.</li><li>Relating to or being a person, topic, or matter that is likely to provoke intense negative reactions or disagreement: The option of raising taxes to fund these expenditures is a politically radioactive approach that a majority of state policymakers have avoided.</li></ul>