Final answer:
Antonyms of 'cumbersome' could be 'lightweight' or 'easy', while synonyms could include 'awkward', 'unwieldy', or 'bulky'.
Step-by-step explanation:
In English, antonyms are words that have opposite or contrasting meanings, while synonyms are words that have the same or similar meanings. The antonyms of 'cumbersome' could be 'lightweight' or 'easy', while synonyms could include 'awkward', 'unwieldy', or 'bulky'.