monstrously
🇺🇸
/ˈmɑːnstrəsli/
🇬🇧
/ˈmɒnstrəsli/
Very wrong and shocking because it's not fair or right.
The boss's decision was monstrously unfair to the workers.
Very big, ugly, or scary, more than normal.
The building was monstrously tall and cast a dark shadow.