monstrous

1 ENTRIES FOUND:
monstrous /ˈmɑːnstrəs/ adjective
monstrous
/ˈmɑːnstrəs/
adjective
Britannica Dictionary definition of MONSTROUS
[more monstrous; most monstrous]
1 
2 
: very wrong or unfair
3 
: very ugly, cruel, or vicious

— monstrously

adverb