- 1considered to be shocking and unacceptable because it is morally wrong or unfair synonym outrageous a monstrous lie/injustice
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- 2very large synonym gigantic a monstrous wave
- 3very large, ugly, and frightening synonym horrifying a monstrous figure/creature
adverb monstrously unfair a monstrously fat manSee monstrous in the Oxford Advanced Learner's Dictionary
Check pronunciation: monstrous