Hello!
Synonym means same. But antonym means opposite, so we are looking for words that have the opposite meaning of "professional" and "laughed".
Expert and chuckled are synonyms of professional and laughed
Skilled and giggled are synonyms of professional and laughed
Talented and chortled are synonyms of professional and laughed
So, the answer would be amateur and cried (since they are the antonyms of "professional" and "laughed")
The tall woman was an amateur athlete who always cried during scary movies.
I hope this helped!