A. Agony: Pain
B. Fearful: Timid
C. Energetic: Lucky
D. Day: Night
“Diffident” means lacking confidence in oneself or one’s abilities, while “Arrogant” means having an exaggerated sense of one’s own importance or abilities. The two words are opposite in meaning, as diffident implies a lack of confidence and self-assuredness, while arrogant suggests an excessive amount of confidence and self-importance.
Similarly, “Fearful” means feeling afraid or anxious, while “Timid” means lacking courage or self-confidence. The two words are also opposite in meaning, as timid implies a lack of confidence or bravery, while fearful suggests an emotion of being scared or alarmed.