<p><strong>Adjective</strong></p><ul><li>not active: an inactive volcano.</li></ul><p><strong>Synonyms</strong></p><ul><li>inoperative</li><li>immobile</li><li>unmoving</li></ul><p><strong>Antonyms</strong></p><ul><li>lively</li></ul><p><strong>Sedentary or passive:</strong></p><ul><li>an inactive life.</li></ul><p><strong>Antonyms</strong></p><ul><li>lively</li></ul><p><strong>Sluggish; indolent.</strong></p><ul><li>Synonyms:<ul><li>slothful</li><li>idle</li><li>lazy</li></ul></li></ul><p><strong>Antonyms</strong></p><ul><li>lively</li></ul><p><strong>Military:</strong></p><ul><li>not on active duty.</li></ul><p><strong>Chemistry:</strong></p><ul><li>inert; unreactive.</li></ul><p><strong>Noting a compound that has no effect on polarized light.</strong></p>