1.Marvelous; strange. (Obs.)
2.Having the qualities of a monster; deviating greatly from the natural form or character; abnormal; as, a monstrous birth. "He, therefore, that refuses to do good to them whom he is bound to love... is unnatural and monstrous in his affections."
3.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.
4.Extraordinary on account of ugliness, viciousness, or wickedness; hateful; horrible; dreadful. "So bad a death argues a monstrous life."
5.Abounding in monsters. (R.) "Where thou, perhaps, under the whelming tide Visitest the bottom of the monstrous world."