The adj hideous has 2 senses (first 2 from tagged texts)
1. (3) hideous, horrid, horrific, outrageous -- (grossly offensive to decency or morality; causing horror; "subjected to outrageous cruelty"; "a hideous pattern of injustice"; "horrific conditions in the mining industry")
2. (2) hideous, repulsive -- (so extremely ugly as to be terrifying; "a hideous scar"; "a repulsive mask")