Secretly desire

• Want very much
• Verb in a biblical admonition
• Long to have (something belonging to another)
• Tenth Commandment word
• Do a biblical no-no
• Crave to possess
• A "shalt not"

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Covet \Cov"et\, v. i. To have or indulge inordinate desire. Which [money] while some coveted after, they have erred from the faith. --1 Tim. vi. 10.

Wikipedia Word definitions in Wikipedia