fresh, new, young
Antonyms for "modern" could include traditional, outdated, or old-fashioned. Antonyms for "fresh" could include stale, old, or rotten.
young
old
The two antonyms for the word "old" are "new" and "young."
Old, mature.
cancel, old
Antonyms are words with opposite meanings. Some examples are large and small, old and new, near and far, and old and young.
past or......out-of-date, or old fashioned
Old maybe
whisper
To provide accurate synonyms and antonyms for Unit 3 vocabulary, I would need specific words or terms from that unit. Generally, synonyms are words with similar meanings, while antonyms are words with opposite meanings. If you can share the specific words from your Unit 3, I can help you find their synonyms and antonyms.
Here is the answer new and fresh or young.