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Definitions

monstrous

[mon-struhs] / ˈmɒn strəs /
ADJECTIVE
unnatural, shocking
Synonyms
STRONGEST
atrocious dreadful egregious freakish frightful grotesque gruesome heinous hideous horrendous horrible horrifying inhuman intolerable obscene odious outrageous preposterous terrible vicious
WEAK
abnormal desperate devilish diabolical disgraceful evil fiendish flagitious foul hellish loathsome morbid ominous satanic scandalous teratoid uncanny unusual
Antonyms
STRONGEST
beautiful delightful glorious great inoffensive magnificent pleasant pleasing wonderful
WEAK
common expected little miniature natural ordinary small standard tiny
ADJECTIVE
very large
Synonyms
STRONGEST
colossal enormous gargantuan gigantic huge immense impressive magnificent mammoth massive monumental towering tremendous
WEAK
cracking elephantine fantastic giant grandiose great prodigious stupendous titanic vast whopping
Antonyms
STRONGEST
dwarfed insignificant little miniature miniscule minute small teeny tiny unimportant unimpressive
WEAK
average common expected natural ordinary standard

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

We know we are not monsters, but we are equally sure that we have done monstrous things.

From Slate • Mar. 16, 2026

Only Byrne’s flashes of humor and desperately flailing humanity keep her on this side of monstrous.

From Los Angeles Times • Feb. 25, 2026

At this point, all we can hope is that his inherent cowardice will win out over his monstrous ego one more time.

From Salon • Feb. 24, 2026

Tennyson plunged into a monstrous grief that afflicted him for years.

From The Wall Street Journal • Feb. 20, 2026

In her imaginary world of Mariposa, Natalie had turned the ugly, monstrous pythons into dragons and sent brave knights out to slay them.

From "Two Degrees" by Alan Gratz

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.