IPA: /ˈmɒnstrəs/
KK: /ˈmɑnstrəs/
Something that is very large, ugly, or frightening, often causing shock or fear.
The monstrous creature emerged from the dark forest, terrifying everyone who saw it.
Monstrous → It is formed from "monstrum" (from Latin, meaning a warning or omen) and the suffix "-ous" (meaning full of or having the quality of). The word "monstrous" describes something that is full of or has the quality of being a warning or an omen, often implying something that is frightful or unnatural.
Think of something that is 'full of' ('-ous') warnings or 'omens' ('monstrum') — that's why monstrous means something frightening or unnatural.