1961, Operation Peace Corps: "a Pig in a Poke", National Defense Committee (1961), page 27:
And how many doctors, nurses, and hospitals to care for them for the next 20 years or so, after they've served their hitch abroad but still keep coming down with odd symptoms of older diseases, most of which will be attributable to their moonbeamish venture into the interior?
1987, David Elliott, "Films in Focus", The Star-Gazette, 22 January 1987, page 15:
Sissy Spacek, as the suicidally moonbeamish sister Babe, is the high point of this hectic drama about a chiming triangle of Southern belles.
2009, "Calendar Restaurants", San Diego Reader, Volume 38, Number 20, 21 May 2009, page 96:
(Of course, no self-respecting New York pizzeria would ever consider serving such moonbeamish Left Coast toppings — not even if they were in New Jersey.)