The singular non buona and the plural non buone in the feminine and the singular non buono and the plural non buoni in the masculine are literal equivalents of the English phrase "not good." Context makes clear which form suits. The respective pronunciations will be "non BWO-na" or "non BWO-ney" in the feminine and "non BWO-no" or "non BWO-ney" in the masculine in Italian.
"Good" in English is buono in Italian.
"It is good!" in English is È buono! in Italian.
"Good! And you?" in English is Buono! E tu? in Italian.
"Good! How are you?" in English is Bene! Come stai? in Italian.
"Good night!" in English is Buonanotte! in Italian.
"Good vacation" in English is buona vacanza in Italian.
"Good health" in English is buona salute in Italian.
"Good artist!" in English is Buona artista! in Italian.
"Good head!" in English is Buona testa! in Italian.
"Good fortune" in English is buona fortuna in Italian.
"Good food!" in English is Buon cibo! in Italian.
"Good lover" in English is buon amante in Italian.