Monster

Something of unnatural size, shape, or quality; a prodigy; an enormity; a marvel.

Specifically , an animal or plant departing greatly from the usual type, as by having too many limbs.

Any thing or person of unnatural or excessive ugliness, deformity, wickedness, or cruelty.

Monstrous in size.

Enormous or very powerful; as, he drove a monster Harley.[informal]

To make monstrous.[Obs.]