"serener" in the adjective sense
1. calm, unagitated, serene, tranquil
not agitated without losing self-possession
"spoke in a calm voice"
"remained calm throughout the uproar"
"he remained serene in the midst of turbulence"
"a serene expression on her face"
"she became more tranquil"
"tranquil life in the country"
2. serene
completely clear and fine
"serene skies and a bright blue sea"
Source: WordNet® (An amazing lexical database of English)
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