<p><strong>Adjective</strong></p><ul><li>of or like a beast; bestial.</li><li>Informal: nasty; unpleasant; disagreeable.</li></ul><p><strong>Synonyms</strong></p><ul><li>disgusting</li><li>mean</li><li>foul</li><li>vile</li><li>hateful</li><li>abominable</li></ul><p><strong>Adverb</strong></p><ul><li>Chiefly British Informal: very; exceedingly: It's beastly cold out.</li><li>British Informal: disagreeably; outrageously: beastly rude.</li></ul>