ETYMOLOGY
irregular from indulge or Latin indulgere + -ate
EXAMPLE
“…Sergius Oratus was the first that made pits for them about his house here; more for profit, then to indulgiate his gluttony. For by such devices he purchased much riches…”
From: A Relation of a Journey Begun an Dom. 1610
By George Sandys, 1615
Lexicophilia 