Hideous means extremely ugly, repulsive or monstrous in appearance. It is an adjective used to describe something that is so unpleasant and grotesque that it evokes feelings of disgust or horror.
Usage examples
The Halloween costume she wore was hideous, with its bright green and orange colors and mismatched patterns.
The abandoned house on the corner of the street had a hideous appearance, with its broken windows and crumbling walls.
The smell coming from the sewer was absolutely hideous, making everyone cover their noses and gag.
The artwork displayed in the gallery was described as avant-garde, but to me, it looked hideous and made no sense.
The politician's comments during the debate were hideous, filled with lies and personal attacks on his opponent.
Recent projects include Prosu (u) mer at EKKM, Tallinn, London, A Shared Space of Difference, Camden Arts Centre, London, PPE, or It is Spring and I am Blind, Modern Art Oxford and staging Brief Interviews with Hideous Men with Andy Holden, ICA, London and Arnolfini, Bristol. (fadmagazine.com)
We're not sure how, but Nintendo managed to make the prospect of being in hideous amounts of debt to a slightly sinister racoon really fun. (gamesradar.com)