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