Horrendous (adjective) — مُرعب ومُروّع: Extremely unpleasant or shocking. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Extremely bad or unpleasant; causing or involving great suffering, fear, or unhappiness; inspiring dread or fear; terrible in degree or extent
Causing shock, horror, or deep moral outrage; extremely bad, offensive, or unacceptable — shocking in quality or conduct
Horrifyingly wicked; extremely bad or unpleasant; shockingly brutal or cruel; of very poor quality
Causing horror; extremely shocking.
Extremely bad, unpleasant, or shocking; also used informally for a large degree of something undesirable
Causing great horror or fear; very bad.
shockingterrible