IPA: /sɪˈriːnər/
KK: /səˈrinər/
More calm and peaceful than something else.
The lake was serener in the early morning than in the afternoon.
Serener → It is formed from "serene" (from Latin "serenus", meaning clear or calm) and "-er" (meaning a person who or something that). The word "serener" refers to something that is more calm or clear than another.
Think of 'serene' meaning calm or clear, and the '-er' indicates a comparison, so 'serener' means more calm or clear.