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mon‧strous

1 very wrong, immoral, or unfair :
Such monstrous injustice is hard to understand.
Such monstrous injustice is hard to understand.2 unusually large :
a monstrous nose
a monstrous nose3 unnatural or ugly and frightening [= hideous]:
a monstrous shadow on the stairs
a monstrous shadow on the stairs —monstrously adverb:
He was ugly and monstrously fat.
It was monstrously unfair.
He was ugly and monstrously fat.
It was monstrously unfair.