The antonym of better is ...
worse
Your bike will ride ____ if you put a new chain on it.
better
The antonym of more slowly is...
more quickly
She smiled (happy) _____ than before.
more happily
Kate spoke____ than she thought during the concert and the violinist looked angrily at her.
more loudly
She is a good dancer. She dances really (good) _____.
well
I speak English (fluent) _____ now than last year.
more fluently
My mother and my sister talked (loud) _____ than the other guest.
more loudly
Lisa runs ____ than me.
faster
Mom asked me to play my music _____ because she said she couldn't hear herself think
more quietly
The antonym of more loudly is...
more quietly
Can you speak _____ I can't understand you.
more slowly
The painter is awful. He paints (awful) _____.
awfully
He had an accident last year. Now, he drives (careful) _____ than before.
more carefully