Answer:
horrendous and monstrous to look at.
Explanation:
Humans have rejected Victor Frankenstein because he was to horrendous and monstrous to look at. His unearthly ugliness had made him too horrifying for the human eyes to see.
Though at first Victor Frankenstein was benevolent and kind, people started to curse and call him a monster after seeing him. His own creator Dr. Frankenstein was disgusted and regretful for creating him too. All these interactions and hatred from the people corrupted his original kind character.