/ ˈmɒnstrəs; NAmE ˈmɑːn-/ adjective
1.
considered to be shocking and unacceptable because it is morally wrong or unfair
SYN outrageous :
a monstrous lie / injustice
2.
very large
SYN gigantic :
a monstrous wave
3.
very large, ugly and frightening
SYN horrifying :
a monstrous figure / creature
► mon·strous·ly adverb :
monstrously unfair
a monstrously fat man
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WORD ORIGIN
late Middle English (in the sense strange or unnatural ): from Old French monstreux or Latin monstrosus , from monstrum portent or monster, from monere warn. Current senses date from the 16th cent.