Sei così sveglia! in the feminine and Sei così sveglio! in the masculine are just two Italian equivalents of the English phrase "You are so smart!"
Specifically, the present indicative verb sei is "(informal singular you) are." The adverb così means "so." The feminine adjective sveglia and the masculine sveglio translate as "intelligent, smart" in this context.
The pronunciation will be "SEH-ee ko-SEE SVEY-lya" in the feminine and "SEH-ee ko-SEE VEY-lyo" in the masculine.
"So adorable!" in English is Cosí adorabile! in Italian.
"So good!" in English means Che bello! in Italian.
"So are you" in English means Anche tu lo sei in Italian.
"I am so tired!" in English is Sono così stanco! in Italian.
"You are so handsome!" in English is Sei così bello! in Italian.
Così felice! in Italian is "So happy! in English.
"I'm so glad!" in English is Sono così felice! in Italian.
"You look so sexy!" in English is Sembri così sexy! in Italian.
"You're so handsome!" in English is Sei così bello! in Italian.
Sono così elegante! and Sono così intelligente!are Italian equivalents of the English phrase "I'm so smart!" Context makes clear whether "I'm so elegant!" (case 1) or "I'm so intelligent!" (example 2) suits. The respective pronunciation will be "SO-no ko-SEE EY-ley-GAN-tey" for smart elegance and "SO-no ko-SEE een-TEL-lee-DJEN-tey" for smart intelligence in Pisan Italian.
no lo so
"You're not so bad!" in English is Lei non è così cattivo! in Italian.