Hideous (adjective) — بشع: Very ugly or horrible. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Unpleasant to look at; nasty.
Causing great horror or fear; very bad.
Causing horror or disgust; very unpleasant.
Extremely unpleasant; disgusting.
Causing shock, horror, or deep moral outrage; extremely bad, offensive, or unacceptable — shocking in quality or conduct
repulsivegrotesquemonstrous
Extremely bad or unpleasant; causing or involving great suffering, fear, or unhappiness; inspiring dread or fear; terrible in degree or extent
Causing horror or disgust.
Causing horror or disgust by being bloody or violent.
Unpleasant to look at.