Definition of: monstrous

(mon′strəs) adjective
1. Deviating greatly from the natural or normal; unnatural in form or structure.
2. Of extraordinary size or number; excessive; huge: a monstrous beast or multitude.
3. Inspiring abhorrence, hate, incredulity, etc., in a remarkable degree; hateful; hideous; incredible; intolerable: a monstrous cruelty. See synonyms under ABSURD, EXTRAORDINARY, FLAGRANT.
—adverb Archaic Extremely. [<OF monstreux <L monstrosus <monstrum. See MONSTER.]
—mon′strous·ly adverb
—mon′·strous·ness noun