<p><strong>Adjective</strong></p><ul><li>requiring much work, exertion, or perseverance: a laborious undertaking.</li><li>characterized by or requiring extreme care and much attention to detail: laborious research.</li><li>characterized by or exhibiting excessive effort, dullness, and lack of spontaneity: a strained, laborious plot.</li><li>given to or diligent in work: a careful, laborious craftsman.</li></ul><p><strong>Synonyms</strong></p><ul><li>wearisome, tiresome, hard, difficult, burdensome, onerous, arduous, toilsome</li><li>painstaking, sedulous, assiduous, industrious, hardworking</li></ul>