1
: offensive to the senses and especially to sight : exceedingly ugly
hideous furniture
The dress looked hideous on her.
2
: morally offensive : shocking
a hideous crime
hid·eos·i·ty
ˌhidēˈäsətē
plural -es
: a hideous thing : hideousness
the high-water mark of hideosity—
Architectural Review
this vile incrustation of hideosities—
Daniel Wickenden
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Merriam-Webster unabridged



