<p><strong>Adjective</strong></p><ul><li>frightful or hideous, especially in appearance; extremely ugly</li><li>shocking or revolting; outrageous: monstrous cruelty</li><li>extraordinarily great; huge; immense: a monstrous building</li><li>deviating grotesquely from the natural or normal form or type</li><li>having the nature or appearance of a fabulous monster</li></ul><p><strong>Adverb</strong></p><ul><li>extremely; exceedingly; very</li></ul>