<p><strong>Adjective</strong></p><ul><li>causing insidious harm or ruin; ruinous; injurious; hurtful</li><li>Synonyms: pernicious, malicious, noxious, baneful, damaging, destructive, deleterious, detrimental, harmful</li><li>deadly; fatal; a pernicious disease</li><li>Synonyms: lethal</li><li>Obsolete: evil; wicked</li></ul>