Here are five sentences with more complex synonyms:

1. Sentence: The cacophony of sounds in the busy marketplace was overwhelming.
   Synonym: cacophony - discord

2. Sentence: She found solace in the serene atmosphere of the library.
   Synonym: solace - consolation

3. Sentence: The project's success hinged on the collaboration of various departments.
   Synonym: collaboration - synergy

4. Sentence: The verdant landscape was a refreshing change from the city's concrete jungle.
   Synonym: verdant - lush

5. Sentence: The enigmatic painting left viewers pondering its meaning.
   Synonym: enigmatic - cryptic
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence