<p><strong>Adjective:</strong></p><ul><li>Spreading or bearing disease, especially deadly epidemic disease; pestilential: pestiferous rats.</li><li>Pernicious; evil: The wicked duke's pestiferous rule blighted the countryside.</li><li>Informal: mischievous; troublesome or annoying: Those pestiferous boys won't leave my apple tree alone.</li></ul><p><strong>End of Response</strong></p>