<p><strong>Adjective</strong></p><ul><li>drabber</li><li>drabbest</li><li>dull</li><li>cheerless</li><li>lacking in spirit, brightness, etc.</li><li>having the color drab</li></ul><p><strong>Noun</strong></p><ul><li>dull gray</li><li>dull brownish or yellowish gray</li><li>any of several fabrics of this color, especially of thick wool or cotton</li></ul>