monster
noun
mon·ster
| \ ˈmän(t)-stər
\
\
Definition of monster
(Entry 1 of 2)
1a
: an animal or plant of abnormal form or structure
a mythical monster a sea monster
b
: one who deviates from normal or acceptable behavior or character
an immoral monster
2
: a threatening force
the same monster — Destiny … that rolls every civilization to doom— W. L. Sullivan
3a
: an animal of strange or terrifying shape
visualize this scaleless monster, eight or nine feet long, sprawling in the shade by the side of the mud pools— W. E. Swinton
b
: one unusually large for its kind
That truck is a monster.
4
: something monstrous
especially
: a person of unnatural or extreme ugliness, deformity, wickedness, or cruelty
His father was a monster who beat his children for no reason.
5
: one that is highly successful
That movie was a monster at the box office.