sérénissime

Borrowed from Italian serenissimo, superlative of sereno.

• IPA^(key): /se.ʁe.ni.sim/

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sérénissime (plural sérénissimes)

1. very serene

   On donne de l’altesse sérénissime à tel prince. ― One gives such serene highness to such a prince.

2. (figuratively) majestuous, very noble
   • 1850, Honoré de Balzac, Les Petits Bourgeois, volume 1, page 109:

     Le second service avait pour plat du milieu une sérénissime oie pleine de marrons.

     (please add an English translation of this quotation)

3. qualifies the Republic of Venice:

   La sérénissime république. ― The most serene republic.

• “sérénissime”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.