Monstrous (a.) Marvelous; strange.

Monstrous (a.) Having the qualities of a monster; deviating greatly from the natural form or character; abnormal; as, a monstrous birth.

Monstrous (a.) Extraordinary in a way to excite wonder, dislike, apprehension, etc.; -- said of size, appearance, color, sound, etc.; as, a monstrous height; a monstrous ox; a monstrous story.

Monstrous (a.) Extraordinary on account of ugliness, viciousness, or wickedness; hateful; horrible; dreadful.

Monstrous (a.) Abounding in monsters.

Monstrous (adv.) Exceedingly; very; very much.