Adj. MASC.. superlative of happy. Derived from the latin "felix felicis» ( cases nominative and genitive ): fertile, the fertile the superlative ending «isimo». Synonyms: afortunadisimo, bienaventuradisimo, dichosisimo, placidisimo, venturosisimo. Antonyms: desafortunadisimo, desdichadisimo, desgraciadisimo, desventuradisimo, infelicisimo, infortunadisimo.