Answer:
Pairs of words opposite in meaning
Explanation:
Interested and indifferent, and bored and fascinated are completely opposite in meaning, which is what is called antonym.
Antonyms are words that share nothing in common due to they are opposing terms.
On the other hand, synonyms are words that share similar meanings.
Another example of pairs of words opposite in meaning would be:
Joyful - Gloomy
Ruthless- Benevolent
