Correct option is A
The correct synonym of the given word is (a)
Repulsive.
Hideous: Extremely ugly, unpleasant, or horrific. (बेहद डरावना या कुरूप)
Example: The monster in the film was truly hideous.
Repulsive: Causing intense distaste or disgust. (घृणित)
Example: His behavior was absolutely repulsive.
Synonyms: repugnant, revolting, disgusting, grotesque.
Antonyms: attractive, pleasant, beautiful.
Meanings of all other options:
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(b) Pretty – Attractive in a delicate way (सुंदर)
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(c) Attractive – Appealing or pleasing (आकर्षक)
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(d) Plain – Simple or ordinary in appearance (सादा)