Hideous (adjective)

1. Extremely unattractive or repulsive.
2. Frightening or terrifying.

Origin:

The word "hideous" comes from the old english word "hīdus" which means "ugly or terrible." it is used in the 14th century to describe something that is extremely unattractive or repulsive.

Examples:

1. The monster had a hideous face.
2. The accident left him with a hideous scar.
3. The painting was deemed too hideous to be displayed in public.
4. The creature's roar was hideous.
5. The architecture of the building was deemed to be hideous by critics.