Sentence:  "Decidedly he was to be a great man, and this was not the moment for letting him go! At the same time there was something impressive in this extraordinary lapse in his eagerness—in his finding it so easy to forget his honors. It was only an intellectual <WSD>Croesus</WSD>, the Countess said to herself, who could afford to keep so loose an account." 
Meaning of the word marked with <WSD> tags:  A rich person.