Milktoast

Ricky [Nelson] was the perfect commodity: an artist who did not upset milktoast America. He was Elvis [Presley] without grease, without swinging hips.

Source: wiktionary

That scientists favored international control of the atom made conservatives even more mistrustful. J[ohn] Parnell Thomas rued the surrender of control to such "a group of milktoasts."

Source: wiktionary

Initially, our heroine hooks up with some milktoast of a guy with lots of money and little personality. Then he comes along—a man she can't push over, a man her wealth and social position can't influence.

Source: wiktionary