<p><strong>Adjective</strong></p><ul><li>such as to cause fright; dreadful, terrible, or alarming: A frightful howl woke us.</li><li>Synonyms: awful, fearful</li><li>Antonyms: delightful</li><li>horrible, shocking, or revolting: The storm did frightful damage.</li><li>Synonyms: gruesome, ghastly, horrid, dread, hideous</li><li>Antonyms: delightful</li><li>Informal: unpleasant; disagreeable: We had a frightful time.</li><li>Informal: very great; extreme: That actor is very talented but a frightful ham.</li></ul>