Moonling

I have a husband, and a two-legg'd one, But such a moonling, as no wit of man, Or roses can redeem from being an ass.

Source: wiktionary

Of the members composing this household, there are but two of whom it will be necessary to speak in this connection; and these are the moonling, or simpleton, and the sister of the wife.

Source: wiktionary

But allow me to say that you were standing like a moonling on that road.

Source: wiktionary

"Jack is n-not a moonling," Catherine said. "His m-mother became ill before his birth. He c-cannot be blamed for any mental deficiency."

Source: wiktionary