1892, Israel Zangwill, The Grandchildren of the Ghetto:
It put a touch of acid into his dulciferous mildness.
1911, James Ira Deese Miller, A Guide Into the South[1], volume I, Atlanta: Index Printing Company, page 35:
He may roil your mind with his collusions but I will elaqueate your dulciferous egoity when your heart dehisces to the epiphoras which house no elench.