Choose the word-pair that is different from the other three.

These words are synonyms. Both refer to a relaxed or unenergetic state.

These words are synonyms. Both describe a sad or somber mood.

These words are synonyms. Both imply strength, energy, or vitality.

These words are antonyms. "Negligent" means careless, while "Attentive" means careful and focused.

Answer: The word-pair Negligent : Attentive is different from the others because it represents an opposite relationship (antonyms), while the rest are pairs of synonyms.

Correct Option: D