Multiple choice Directions: Choose the most similar word from the options given below. Sullen affable derail resentful castigate Reveal answer Fill a bubble to check yourself C Correct answer Explanation Resentful is a correct synonym for sullen, as sullen means bad-tempered, sulky, or silently resentful. Affable (A) means friendly - the opposite. Derail (B) means to throw off course. Castigate (D) means to criticize severely.