6618. I found his crude manners abominable.

✅ The correct answer is option C.
Flattering : full of praise and compliments.

Sloppy : careless and unsystematic; excessively casual.

Detestable : deserving intense dislike.

Attractive : pleasing or appealing to the senses.

Abominable : causing moral revulsion.

Synonym of Abominable is Detestable