<p><strong>Adjective</strong></p><ul><li>being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society.</li><li>of practical use, as for doing work; producing material results; supplying common needs: the useful arts; useful work.</li></ul><p><strong>Synonyms</strong></p><ul><li>beneficial</li><li>efficacious</li><li>profitable</li></ul><p><strong>Antonyms</strong></p><ul><li>useless</li></ul>