Significatio vocis serenus | Babel Free

Definitiones

1. Clear, fair, bright, serene, tranquil.
   adjective, declension-1, declension-2
2. That clears the sky or brings fair weather.
   adjective, declension-1, declension-2
3. Cheerful, glad, joyous, bright; clear, fair, calm, placid, serene
   adjective, declension-1, declension-2, figuratively

Aequivalentia

Exempla

“‘… Quae causa indigna serēnōs / foedāvit voltūs? ….’”

“‘What shameful cause disfigured your serene face?’” (Aeneas dreams he is speaking to the dead and disfigured Hector. The Latin plural “serenos voltus,” here translated as English singular, implies a heroic character which projects steadfast calm despite changing circumstances.)

Gradus CEFR